The Rent Roll Is Not Income: What Proves a Building Earns What It Says

A rent roll line reads like a fact. One tenant, one floor area, one passing rent, one expiry date, one next review. The committee reads down the column and adds it up, and the sum is the income the model runs on.

Take the line apart and it is three answers to three questions nobody in the room asked. Which document set the rent: the original lease, a deed of variation four years later, or a side letter granting eighteen months rent-free that the roll may or may not have netted off? Which document set the expiry: the term in the lease, or a commencement letter that filled in a date the lease left blank and moved every break window with it? Which document confirms that the tenant agrees? The rent roll has no column for the answers. Whoever keyed the line made a precedence decision for each field, and the line records the result without recording that a decision was made.

The lenders wrote this problem down first. Fannie Mae’s multifamily guide requires a lender, before committing, to audit the leases and reconcile the rent roll against the signed documents. The rule exists because the two routinely differ, and because the lender, unlike the acquirer, is paid only if the cash arrives.

Two orders of precedence are at work. Inside the lease file, instruments rank one another. Outside the file, records rank one another: the summary, the executed stack, the ledger and the bank, the register or filed return. An earlier note set out the five parts a cited number has to carry; this one goes into the file behind the number. The Smart Bricks Research Lab has been working through what proves a building earns what its rent roll says, drawing on lender rulebooks, the conveyancing standards of England and Wales, and published measurements of collections and lease events; what follows is the order of authority, the four records, the chain that joins them, and where it breaks.

A tenancy is a set of instruments, and the set has rules: the ordinary law of contract applied to a file that grows for fifteen years. What is rare is anyone writing down, for a given rent roll line, which rule produced which field.

Heads of terms sit upstream of everything. Since September 2020, the RICS professional standard on leasing business premises in England and Wales has required the agreed terms of a letting to be recorded in written heads of terms, subject to contract, covering as a minimum the premises, term, break rights, rent, rent-free period, review mechanism and service charge basis. Heads of terms govern nothing once the lease is signed. Their value is as a baseline: for any English business letting since that date there is a written record of what the deal was meant to be, and any departure in the executed lease was negotiated by someone and should be explained.

An amendment governs the original on the clauses it touches and nowhere else. A deed of variation that restates the rent review clause leaves the break clause where it was; a second that restates the break leaves the review as the first left it. After three instruments the rent may run from one, the review from another and the break from a third, and a reviewer who reads only the latest deed misses what the earlier ones still control.

A side letter can displace both, and binds only those who signed it. Rent-free periods, capped service charges, personal break rights, an agreement not to enforce a covenant: the concessions that most affect cash live here, in a letter that is not a deed, is often not annexed to the lease, and may be personal to the current parties. A study of side letters in an adjacent field, private equity fund documentation, found that across 252 letters and 96 partnership agreements over thirty years the average letter grew from 1.3 pages before 2005 to 8.5 pages after the financial crisis. Fund side letters are not lease side letters; the analogue is offered for its shape only: the instrument that quietly modifies the master document grows outside the master document’s own schedule.

A commencement letter fixes no commercial term and fixes every date. It restates no rent. It states the day from which the term, and therefore every rent step, review, break window and option deadline, is counted. A lease granting ten years from a date to be confirmed has no expiry until the letter exists, and a rent roll keyed before it was signed is off by whatever the fit-out took.

An estoppel certificate is the tenant’s own account, and the only instrument in the stack that a third party signs. The tenant confirms, at a stated date, the rent, the term, the amendments it recognises, any arrears or prepayments, and any default it alleges. It changes nothing in law. It binds the tenant to a dated statement the landlord did not write, which is why lenders rank it above the landlord’s summary: Fannie Mae’s guide requires one for each material commercial lease, materiality set at 5% of a property’s effective gross income, with a subordination and non-disturbance agreement required separately because priority against the mortgage is a different question.

The conveyancing profession has arrived at the same structure from the other side. The City of London Law Society’s certificate of title, in its eighth edition, has the certifying solicitor confirm that the letting documents are fairly and accurately summarised in a schedule, keeps supplemental documents in a separate part of that schedule, has the seller confirm that all rent is paid to date and none commuted, waived or paid in advance, and deals with variations separately: four statements, because there are four ways the summary and the file part company.

Instrument	Who signs	What it fixes	What it can displace	What it cannot tell you
Heads of terms	Who signsParties or agents, subject to contract	What it fixesThe deal as agreed before drafting (RICS Code 1.3 makes it mandatory in writing for English business lettings)	What it can displaceNothing; it is the baseline the lease is tested against	What it cannot tell youWhether the executed lease actually followed it
Original lease	Who signsLandlord and tenant	What it fixesPremises, term, rent, reviews, breaks, repair, use	What it can displaceNothing	What it cannot tell youAnything later agreed
Amendment or deed of variation	Who signsLandlord and tenant	What it fixesThe specific clauses it restates	What it can displaceThe original, on those clauses only	What it cannot tell youThe clauses it left alone, which still run from the original
Side letter	Who signsUsually landlord and tenant, sometimes one party	What it fixesConcessions: rent-free, caps, personal breaks	What it can displaceThe original and any amendment, for its signatories only	What it cannot tell youWhether a successor landlord or lender is bound by it
Commencement letter	Who signsLandlord's or tenant's solicitor	What it fixesThe date every rent step, review, break window and option is counted from	What it can displaceDates implied by the lease	What it cannot tell youRent, term or any commercial term
Estoppel certificate	Who signsTenant, at a stated date	What it fixesThe tenant's account of rent, term, amendments, arrears, prepayments and defaults	What it can displaceNothing as a matter of law, but it binds the tenant to its account	What it cannot tell youWhat changed after its date
SNDA and lender consents	Who signsTenant, landlord, lender	What it fixesPriority of the lease against the mortgage	What it can displaceNothing in the lease itself	What it cannot tell youAny commercial term

A later instrument governs the earlier one only on the clauses it touches, so every field in a rent roll line has its own governing document. The estoppel is the only instrument in the stack that a third party, not the landlord, has signed.

Source: RICS, Code for leasing business premises (2020), paragraph 1.3; CLLS Certificate of Title, Eighth Edition 2023, Schedule 5; Fannie Mae Multifamily Guide, Sections 111.01D and 111.01E; Smart Bricks Research Lab

Resolving the file answers one question: what was agreed. Three other questions stand behind a rent roll line, and each has its own record.

The rent roll answers what the seller summarised, on a date. It is prepared by the party with an interest in the price, it inherits every precedence decision made when it was keyed, and it is useful for one thing: it states the claim the other three records are tested against.

The executed stack answers what was agreed, and which instrument governs each term. It is reliable as far as it is complete, and the seller decides how complete it is. A side letter held by asset management and never copied to the data room is not in the stack the buyer reads.

The ledger and the bank statements answer what was collected. The tenant ledger is the manager’s document: what was billed, when, and what is outstanding; it shows concessions if the manager billed gross and credited them, and hides them if the manager billed net. The bank statement is the only document in the chain whose author has no view on the price. Together they answer what came in, when, net of what.

The registered or filed record answers what a third party accepted. It answers a narrower question than most memos assume. In England and Wales, the grant of a lease for more than seven years is a registrable disposition under the Land Registration Act 2002, so a long commercial lease reaches the register. What the register holds is sufficient particulars to identify the lease: the parties, the term, the land. HM Land Registry’s practice guidance states that the register no longer carries any reference to the rent payable, and a lease of three years or less cannot be noted at all. The register proves the lease exists, between whom, and for how long, and is silent on the number the model runs on.

A filed record of the rent does exist in England and Wales, with the tax authority. Stamp duty land tax on a new lease is charged on the net present value of the rent over the term, and HMRC requires a return for most new leases even where no tax is due, so the rent is stated to a government body, by the tenant, at grant. It is not published, and a buyer sees it only if the seller produces it.

The United States records deeds county by county and guarantees no title. A lease reaches the county record, if at all, as a short memorandum recorded to give notice to later purchasers, and the memorandum commonly leaves the rent out by design. Title insurance covers ownership and encumbrances, not the rent roll. The Netherlands and the Nordic countries record different things again, so a firm holding assets across all four has a different top record in each, and the memo should state what the register was asked and what it answered.

Independent market data answers a fifth question: whether the rent agreed is a market rent. A rent can be agreed, billed, collected and filed and still be a concession dressed as a headline. Index and transaction evidence is the test for that, and RICS’s grading of comparable evidence applies to it directly: the one record that says nothing about this tenancy and everything about whether its number would survive a re-letting.

Record	Question it answers	Who produced it	Counterparty that had to accept it	Records the rent? (England and Wales / Dubai / Singapore)
Seller rent roll	Question it answersWhat did the seller summarise, on a date	Who produced itSeller or its manager	Counterparty that had to accept itNone	Records the rent? (England and Wales / Dubai / Singapore)Yes, as summarised / Yes / Yes
Executed lease stack	Question it answersWhat was agreed, and which instrument governs each term	Who produced itLandlord and tenant	Counterparty that had to accept itThe tenant	Records the rent? (England and Wales / Dubai / Singapore)Yes, across several instruments / Yes / Yes
Tenant ledger and bank receipts	Question it answersWhat was billed and what was collected, net of concessions and arrears	Who produced itLandlord's manager and the bank	Counterparty that had to accept itThe bank, for receipts	Records the rent? (England and Wales / Dubai / Singapore)Shows cash, not contract / same / same
Registered or filed record	Question it answersWhat a third party accepted about the tenancy	Who produced itRegistrar or tax authority	Counterparty that had to accept itThe registrar	Records the rent? (England and Wales / Dubai / Singapore)Register: no rent (LRR 2003 r.6); SDLT return: rent, not public / RERA: rent and amendments registered / IRAS: stamped rent feeds URA statistics
Independent market data	Question it answersWhether the agreed rent is a market rent	Who produced itIndex publisher or registry-derived statistic	Counterparty that had to accept itNone for surveys; the registrar for registry-derived series	Records the rent? (England and Wales / Dubai / Singapore)Not applicable / RERA Rent Index / URA rental statistics

The rent roll is treated as though it answered all four questions. It answers the first. The register answers different questions in different markets, and in the market with the strongest register it is silent on rent.

Source: Land Registration Act 2002 s.27; HM Land Registry Practice Guide 25; HMRC SDLT leasehold guidance; Dubai Law No. 26 of 2007 Article 4(2) as amended; Decree No. 43 of 2013; URA Property Market Information; Smart Bricks Research Lab

Put the four records in order and a procedure falls out, one agency lenders have run a version of for years. It is four reconciliations, each with a named pair of documents and a named test.

Line to governing instrument. For each field in the line, name the instrument that governs it and write down why: the deed of variation for the rent, the original lease for the review, the side letter for the rent-free, the commencement letter for the dates. The test is whether a stranger, given the file and the note, would reach the same field.

Governing instrument to ledger. Billed rent should equal contracted rent for each period, and where it does not, a concession schedule should explain the whole gap: which letter granted the rent-free, for which months, against which invoices. A ledger that bills net of the concession will match the lease’s headline nowhere and the cash everywhere, and a reviewer who has not seen the side letter will read the difference as arrears.

Ledger to bank. Billed should equal received, with the difference aged. Fannie Mae’s guide names the documents: a cash ledger or receipts journal, at least three months of bank statements confirming the rent deposits, and a receivables report walked through with the site manager, compiled into a lease audit form that tests the lease terms against the rent roll. The sample is sized by unit count and expanded wherever a material discrepancy appears. That is US agency multifamily lending, but the structure transfers.

What the reconciliation finds, where anyone has measured it at scale, is a gap. Remit Consulting reported 94.8% of rent due on UK commercial property collected within 21 days of the March 2024 quarter day, across around 125,000 leases, the best 21-day reading since 2019; the missing five points are the difference between passing rent and cash for that quarter, before anyone asks about day 60. In the United States, the NMHC Rent Payment Tracker pooled data from five property-management software providers across 11.8 million professionally managed apartment households and recorded the share paying in full or in part by month end falling from 95.9% in 2019 to 92.0% in December 2021. Neither series is the building in front of the committee; both show the shape of the number the rent roll leaves out.

Tenancy to register. Join the tenancy to its register entry or filed return and record what it confirmed: parties and term in England and Wales, the memorandum’s contents in a US county, the rent only where the jurisdiction files it. The join has to state its own limits, or registered becomes a synonym for verified.

The chain then reaches the expiry column, and the reconciliations stop being about documents and start being about probabilities. MSCI’s review of lease events across more than 95,000 UK leases found that 29% of leases expiring in 2018 were renewed, the lowest rate since 2007, that 56% of units stood vacant for a quarter or more after expiry, and that 26% of exercised breaks, by rent, ended in vacancy of a quarter or longer. A rent roll carries the expiry as a date. The model has to carry it as a distribution, and these are the published parameters.

The amendment did not correct the lease. It replaced one clause and left the rest. The rent roll never found out.

Smart Bricks Research Lab

The breaks are not random. Each link fails in a characteristic way, and the conveyancing checklist and the lender rulebook are, read closely, catalogues of those ways.

At the first link, the amendment that never reached the abstract. The lease was abstracted when the asset was bought; asset management negotiated a deed of variation three years later, which was executed and filed with the legal team; the abstract, and the rent roll built from it, still show the original clause. The process literature describes the same pattern: amendments never consolidated, so nobody can say what is in force; side-letter concessions that never reach the system of record; critical dates kept in spreadsheets without notice offsets; escalations miscalculated so the shortfall compounds year on year.

At the second, the commencement letter that moves everything by a month. The lease was keyed with an assumed commencement; the letter fixed a later one; every review, step and break window in the roll is now early by the difference, and the first anyone learns of it is a tenant’s solicitor pointing out that a notice was premature.

At the third, the concession netted at billing. The ledger bills the net rent, the lease shows the headline, both look internally consistent, and cash is lower than the roll by an amount that appears nowhere as a concession because it was never billed. The certificate of title asks separately about rent commuted, waived or paid in advance for this reason.

At the fourth, the estoppel that contradicts the roll and is filed rather than reconciled. The tenant states arrears the roll does not show, a rent-free it does not carry, or an amendment the data room does not contain. The certificate goes into the closing binder as a condition satisfied. Nobody changes the line.

At the fifth, the register consulted once by counsel and never joined to the line. Title was read at legal due diligence, the report noted the lease as registered, and neither the title number nor what the register did and did not confirm ever reached the rent roll or the model.

And at the expiry column, the office lease carried forward at contracted rent. In MSCI’s 2018 data, 77% of expiring office rent went straight to vacancy, and 89% of exercised office breaks did the same. An expiry column carried at passing rent to the end of the hold is, on that evidence, the largest single break between a rent roll and a cash flow, and the least likely to be flagged, because the number in the roll is correct.

• 94.8%

  UK commercial rent collected within 21 days of the March 2024 quarter day, around 125,000 leases

  Remit Consulting REMark, 13 May 2024

• 95.9% to 92.0%

  US apartment households paying in full or part by month end, 2019 to December 2021, 11.8 million households

  NMHC Rent Payment Tracker retrospective, 2022

• 29%

  UK leases expiring in 2018 that were renewed; 56% of units vacant for a quarter or more

  MSCI UK Lease Events Review, November 2019

• 26%

  Exercised UK break clauses that ended in vacancy for a quarter or more, 2018, rent-weighted

  MSCI UK Lease Events Review, November 2019

• 10%

  Share of leases a Fannie Mae lender must audit against the rent roll on a 10 to 300 unit property, plus at least three months of bank statements

  Fannie Mae Multifamily Guide, Section 401, effective 14 September 2026

• 1.3 to 8.5 pages

  Growth in the average private equity side letter over thirty years, 252 letters sampled

  de Fontenay and Nili, Washington University Law Review, 2023

Collections and lease events are the only links measured at portfolio scale. The gaps they show are the difference between a rent roll and income.

Source: Remit Consulting; NMHC; MSCI; Fannie Mae; de Fontenay and Nili (2023)

The earlier note on the data layer set tests for how a system should handle a figure; these are the tests for how it should handle a file, stated as requirements a committee can put to its own team or a vendor.

It holds the tenancy as an ordered set of instruments, with the precedence rule written down. Not a document folder: an ordered list in which each instrument states what it displaces and what it leaves, so the governing text for any clause can be read off without a lawyer rereading the file.

It cites the governing instrument, not merely a document, for every field. A rent cited to the original lease when a deed of variation restated the clause is a wrong answer with a footnote; the citation has to be to the instrument that won, with the date it won.

It carries the estoppel as a third-party test, with its date. The tenant’s account is compared to the line field by field, and the comparison expires: an estoppel is true at its date, and the system should know how old it is.

It ties each line to billed and received cash, with the concession schedule explaining the gap. Contracted, billed and received are three columns, not one, and every difference between them names the instrument that caused it.

It joins the tenancy to the register key and records what the register confirmed in that jurisdiction. Parties and term where that is what the register holds; rent where a filed return is available; an explicit note where the register cannot be asked, as for a short lease in England and Wales.

It surfaces conflicts for a person and resolves none of them silently. Where two instruments both claim a clause, or the estoppel contradicts the roll, or the heads of terms differ from the executed lease, the disagreement is presented with both texts and a named reviewer decides. Two external templates for a resolved tenancy record already exist: the lender’s estoppel and audit forms, and the certificate of title’s schedule of letting documents with its separate part for supplemental instruments. A system that cannot produce the equivalent of both is asserting that its rent roll is right rather than showing it.

The argument can be tested before anything is bought, on one tenant, in a day. Take the largest line on the rent roll and walk it through the chain.

The six questions in Exhibit 4 are answered in writing, from the data room alone, before anyone picks up the phone. The lender’s list of a cash ledger, a receipts journal and at least three months of bank statements is the minimum for the cash question; twelve months is better. The register entry or the filed return is pulled and read, not taken from counsel’s report.

The finding is a count: how many of the six answers came from the data room and how many needed a phone call to the seller, the tenant or counsel. A committee that sees the count for the largest tenant knows what the rest of the roll is likely to look like, and knows it before exclusivity ends.

1. 1

   Governing instrument

   For rent, term, expiry and break: which document governs each field, and is the precedence written down anywhere

2. 2

   Heads of terms

   Does the executed lease match the agreed heads, and where it departs, is the departure explained

3. 3

   Supplemental documents

   Are all amendments, side letters and commencement letters in the room, and does any reference a document that is not

4. 4

   Estoppel

   Is there a dated tenant estoppel, and does it agree with the rent roll line on rent, arrears, prepayments and amendments

5. 5

   Cash

   Do twelve months of billed and received rent tie to the contracted rent, with the concession schedule explaining every gap

6. 6

   Register

   Has the tenancy been joined to its register entry or filed return, and what did that record confirm in this jurisdiction: parties and term only, or rent as well

Run on the largest tenant in the rent roll before exclusivity ends. The finding is how many of the six answers came from the data room and how many needed a phone call.

Source: Smart Bricks Research Lab, drawing on Fannie Mae Multifamily Guide Sections 111 and 401 and the CLLS Certificate of Title Schedule 5

The chain costs three things, and none of them is software.

It costs negotiation capital. Estoppels are asked of tenants, a seller will resist a buyer approaching its tenants before exchange, and a tenant with a grievance will use the certificate to air it. It costs time inside a short window, and the time is a lawyer’s or a senior analyst’s, because deciding which instrument governs is judgment. And it costs reviewer hours per exception, indefinitely, because tenancies keep generating instruments after completion and the chain has to be rerun each time one arrives.

It also runs out, in four places that should be stated rather than discovered.

The register is silent on rent where it is strongest. In England and Wales the entry identifies the lease and says nothing about what is paid under it; the return that does state the rent sits with HMRC and is not public. In a US county the memorandum leaves the rent out by design. The top of the hierarchy confirms that the tenancy exists and who the parties are; for the number in the model it defers to documents the seller controls.

Collections history is a seller’s document until exclusivity. The ledger is the manager’s, and the bank statements arrive when the seller agrees to produce them. Before that the buyer is working from the rent roll and the published series, which describe a market, not a building.

A side letter the seller does not produce cannot be reconciled, only warranted against, and a warranty is a claim, not a rent. The certificate of title’s schedule of supplemental documents certifies what the seller disclosed, not what exists.

And the lease events data gives probabilities. MSCI’s renewal and vacancy rates and the Remit and NMHC collections curves price an expiry column across a portfolio; they do not say what the one tenant paying a third of the income intends to do at its break, and no record in the chain does. That remains a conversation.

What the chain does, stated honestly, is convert unknowns into named unknowns. Before the walk, the committee has a rent roll and a conviction. After it, the committee has, for each line, the governing instrument or a note that none was found; the cash or a note that it was not produced; the tenant’s account or its absence; and the register’s answer to the question the register can answer. Some of those are gaps. All of them can be priced, because they are written down. A rent roll is a claim about income; the chain turns it into evidence, and where it cannot, says so.