San Francisco Multifamily Underwriting: Pre-Close Checklist

San Francisco multifamily underwriting requires more than checking the seller's income statement. Buyers need to establish whether existing rents are lawful, which increases remain available, how each unit is regulated, and what the building actually costs to operate. Missing any of these details can leave an acquisition pro forma overstating income or understating expenses.

Key Takeaways

• A rent roll shows what tenants are paying, not necessarily what an owner can legally collect.
• Rent-control classification determines which income-growth assumptions belong in the model.
• Insurance, staffing, utilities, and mandatory building work deserve independent cost estimates.
• Property taxes need to reflect the buyer's post-acquisition assessment, not the seller's historical bill.
• Regulatory and capital exposure should be investigated before closing, while there is still time to resolve discrepancies.

Why an SF Pro Forma Breaks in Year One

Consider a 24-unit building in the Richmond District. The offering memorandum shows steady collections, moderate maintenance expenses, and room for rental growth. The building appears straightforward until somebody starts asking for the underlying records.

Several leases are missing. One apartment has a rent increase that cannot be reconciled with the previous notices. The insurance policy expires shortly after closing. Meanwhile, the repair budget includes regular plumbing calls but no provision for replacing the deteriorating pipes.

None of those details necessarily make the property unsuitable for acquisition. They do, however, change what a buyer needs to know about its future operation.

A multifamily acquisition pro forma sets out the income and expenses a buyer expects the building to produce under its own ownership, rather than what it produced for the seller. It is only as dependable as its assumptions. Sellers and brokers generally present the information available to them, often with adjustments reflecting a proposed operating plan. The prospective owner still needs to distinguish documented income from anticipated income and recurring costs from expenses that have simply been postponed.

A pre-acquisition due diligence review of the apartment building addresses that gap. An operating review complements the buyer's legal, financial, and physical inspections by examining what it will take to manage the building after ownership changes.

Are the In-Place Rents Lawful and Defensible?

Begin with the leases, then work forward.

For each occupied apartment, establish the starting rent, subsequent increases, notices delivered, and current amount collected. Compare those records with the applicable provisions of San Francisco Administrative Code Chapter 37, particularly Section 37.3.

A rent roll alone cannot establish compliance. An apartment collecting $2,800 monthly might have reached that amount through properly documented increases. Another collecting the same amount might have an unresolved overcharge. The financial statements would show identical revenue; the legal exposure is different.

Review Rent Board petitions and decisions, tenant correspondence, and any agreements modifying rent or housing services. Request the notices themselves rather than accepting a spreadsheet summarizing previous increases.

This investigation belongs alongside a comprehensive rent roll audit. A discrepancy discovered before closing can be examined by counsel and incorporated into the buyer's assessment of operating exposure. After closing, the new owner may find it considerably harder to reconstruct years of incomplete records.

Banked Increases: Real, Forfeited, or Assumed

Banked rent increases deserve separate examination because they frequently appear in financial projections without enough supporting documentation.

Under San Francisco Rent Board Rules and Regulations, Section 4.12, a landlord may accumulate allowable annual increases that were not previously imposed. The rules restrict when these amounts can be applied and prohibit compounding banked increases. They are not an unrestricted pool of additional rent.

To establish whether an amount is available, reconstruct each tenant's increase history, including the effective dates, annual allowances, and previously imposed increases. Do not assume a seller's spreadsheet has performed that calculation correctly.

The documentation also needs to establish the current rent increase license. San Francisco's Housing Inventory requirements link the ability to impose annual and banked increases to required reporting.

For underwriting purposes, an undocumented banked increase should remain outside projected income until verified. The separate banked-increases review can address the detailed calculation.

Controlled, Decontrolled, or Statewide: What Classification Does to the Growth Assumption

An investor purchasing a mixed-vintage building should not apply one rent-growth rate to every apartment.

San Francisco's local rent stabilization rules, California's Tenant Protection Act, and applicable exemptions create different regulatory outcomes. Construction history, unit characteristics, and certain legal restrictions matter.

Many older apartments fall under the city's local rent cap. Other units may instead be governed by California Civil Code Section 1947.12, while some properties qualify for exemptions.

As of October 2026:

• San Francisco's allowable annual increase for locally rent-controlled units is 1.6%, effective March 1, 2026, through February 28, 2027.
• The statewide AB 1482 limit for covered units in the San Francisco area is 8.8%, effective August 1, 2026, through July 31, 2027. This reflects the statutory formula of 5% plus the applicable CPI change, subject to a 10% ceiling.

These figures describe different regulatory systems. They should not be treated as interchangeable, nor should either be applied automatically without checking the unit's status.

The California Attorney General publishes the current statewide and local rent-cap figures.

Rent control risk underwriting starts with a unit-by-unit classification schedule. Record the construction and occupancy information, applicable exemption, tenant history, governing rent rules, and supporting documentation.

For a building containing several regulatory categories, separate growth assumptions may be necessary.

Turnover and Re-Lease Assumptions Against Actual SF Timelines

Vacancy assumptions can make a substantial difference to projected income, particularly where a model expects rents to reset when tenants leave. Turnover, however, is not something a buyer can assign a convenient date to.

Review the property's actual history. Which units became vacant during the seller's ownership? How long did preparation and leasing take? What did cleaning, repairs, advertising, and concessions cost? Compare those records with the proposed budget.

A renovated apartment might lease quickly. Another may require substantial electrical or plumbing work before it can be marketed. The same neighborhood does not guarantee identical outcomes.

California's Costa-Hawkins Rental Housing Act generally permits qualifying new tenancies to begin at a newly established rent, but exceptions apply. A future reset therefore cannot be treated as certain income merely because a unit is rent controlled.

The legal mechanics belong in the separate article on vacancy decontrol in San Francisco.

For the acquisition model, the discipline is simpler: distinguish existing rent from potential future rent, and test the effect of longer vacancy periods and higher preparation costs.

The Expense Lines Broker Packages Systematically Understate

Operating expenses often require just as much reconstruction as rental income.

Insurance and utilities

Obtain an insurance quote for the property under the proposed ownership arrangement. The seller's expiring premium may not reflect the coverage, deductibles, or underwriting conditions available to the buyer.

Review loss history, roof condition, major building systems, and outstanding safety work before treating the existing premium as a reliable forecast.

Water and sewer expenses deserve similar scrutiny.

Compare bills, consumption, unit occupancy, and any changes in metering arrangements. A master-metered building may conceal leaks or inefficient fixtures within its utility expenses. Use current SFPUC rate information rather than assuming past charges will remain unchanged.

Maintenance, staffing, and management

A low maintenance line is not necessarily evidence of efficient operation.

Request work orders and vendor invoices. Repeated service calls for the same equipment may indicate that replacement has been delayed. The operating budget should capture recurring service costs, while the capital plan separately addresses major replacements.

For buildings containing 16 or more apartments, California's resident-manager requirements under Title 25, Section 42 warrant particular attention. Buyers should confirm the property's staffing arrangement and review related employment, wage, and lodging documentation with qualified advisers.

Management fees need scrutiny as well. A seller who manages the property personally, or through an affiliated company, may report expenses that would not apply under an independent management contract.

Expense benchmarking only works when San Francisco owners compare properties of similar age, size, construction, service arrangements, and utility responsibilities. A useful comparison considers what is included in the cost, not merely the total amount.

See the companion review of San Francisco apartment operating expenses for the category-by-category analysis.

Taxes and Transfer Costs at Close

The seller's property tax expense is not a dependable estimate of the buyer's future tax liability.

Under California's change-in-ownership framework, including Revenue and Taxation Code Section 60, a taxable ownership transfer generally triggers reassessment, subject to applicable exclusions.

A building held for decades may carry an assessed value substantially below the amount reflected in a new transaction.

The buyer should therefore examine the expected post-close assessment with the San Francisco Assessor-Recorder.

San Francisco's real property transfer tax is another transaction cost requiring review. Confirm the applicable treatment and allocation with the closing professionals rather than rolling it into annual property operating expenses.

Keep recurring tax costs and one-time acquisition expenses separate. Otherwise, the model can distort both stabilized net operating income and the initial cash required to complete the purchase.

Open Code Cases, Deferred Maintenance, and Capital Due Inside the Hold

A physical inspection tells the buyer what an engineer or inspector can observe. City records may reveal another part of the building's history.

Search the Department of Building Inspection's complaints and violations records. Review open notices, permits, inspection results, and unfinished work.

Particular attention should go to seismic and exterior elevated-element requirements.

San Francisco's Mandatory Soft Story Retrofit Program identifies buildings by compliance tier. The city's soft-story property dataset allows buyers to check a property's recorded status. Obtain the underlying permits and completion documentation rather than relying solely on a database entry.

California's Health and Safety Code Section 17973, commonly associated with SB 721, establishes inspection and repair obligations for certain exterior elevated elements in qualifying multifamily properties. Request the inspection reports, repair findings, and evidence of required follow-up.

A building may also have major components approaching replacement despite having no outstanding violation.

Review the age and condition of roofs, water heaters, electrical equipment, plumbing, elevators, and other critical systems. Match anticipated replacement work to the proposed holding period.

A generic reserve allowance cannot substitute for a dated capital plan when specific work is already identifiable.

Where the Pro Forma Breaks

Pro forma assumption	How it can fail in San Francisco	What to verify before closing
Existing rents are lawful	Historical increases or notices may be defective	Leases, notices, rent history, petitions
Banked increases are available	Amounts may be miscalculated or unsupported	Unit-level increase history and Rent Board records
All rents grow at one rate	Different units may have different regulatory limits	Unit classification and applicable exemptions
Vacancies reset to market	Not every vacancy qualifies for a reset	Tenancy history and statutory restrictions
Insurance costs remain stable	A new policy may have different premiums or terms	Current insurer quote and coverage
Property taxes remain unchanged	Change of ownership generally triggers reassessment	Post-acquisition tax basis
Payroll is minimal	Larger buildings may require resident-manager staffing	Unit count and employment arrangements
Capital expenses are predictable	Known retrofit or repair work may fall within the hold	Inspection reports, open cases, equipment condition

The purpose of this table is not to assume the seller's information is incorrect. It identifies where the proposed numbers need supporting evidence.

Local Rules a National Checklist Misses

Several San Francisco requirements can affect operating decisions without appearing as individual expense lines in a broker package.

Just-cause protections: San Francisco's Rent Ordinance regulates the grounds and procedures for terminating covered tenancies. Statewide protections may also apply. Buyers need to understand those restrictions before making assumptions about possession or redevelopment.

Tenant buyouts: Section 37.9E establishes disclosure and procedural requirements for regulated buyout negotiations. A potential agreement must never be treated as a guaranteed vacancy or an informal means of avoiding tenant protections.

Housing Inventory: Residential property owners must meet the Rent Board's annual reporting requirements. For covered units, the required rent increase license affects the enforceability of annual and banked increases.

Algorithmic rent-setting: San Francisco Administrative Code Section 37.10C prohibits specified algorithmic devices that use nonpublic competitor information to advise on rents or occupancy. Acquisition plans should not depend on prohibited rent-setting tools.

These requirements belong in the operating assumptions, even where their financial impact cannot be expressed as a fixed annual allowance.

The Pre-Close Checklist

Before finalizing San Francisco multifamily underwriting, obtain the following records:

1. Complete rent roll and executed leases: Include amendments, concessions, deposits, and current payment records.
2. Unit-level rent histories: Obtain increase notices, calculations, and supporting records for banked amounts.
3. Regulatory classification schedule: Document construction history, applicable rent rules, and claimed exemptions for each apartment.
4. Rent Board records: Review petitions, decisions, Housing Inventory submissions, and rent increase licenses.
5. Operating expense records: Request historical financial statements, utility bills, vendor invoices, payroll records, and service contracts.
6. Current insurance information: Obtain existing policy terms, claims history, and a replacement coverage quote.
7. Property tax and closing-cost review: Assess the post-transfer tax basis and applicable transaction expenses.
8. Building compliance records: Review DBI complaints, permits, soft-story status, and exterior elevated-element inspection documentation.
9. Capital condition assessment: Identify replacement work, repair obligations, and anticipated expenditure during the hold.
10. Turnover and leasing records: Establish historical vacancy periods, preparation costs, concessions, and documented re-lease outcomes.

This checklist is a starting point for an operating review, not legal, tax, or investment advice.

The value of pre-close analysis lies in replacing assumptions with records while the buyer still has the opportunity to investigate. BanCal Properties can discuss the operating information needed for a pre-acquisition property review.

Frequently Asked Questions

Author  Kelli Smith