A Reader Asked: “How Do You Run Due Diligence on a Small Multifamily Deal When the Seller Won’t Share Actual Expense Records?”

Last updated: September 4, 2026

How to run due diligence on small multifamily when seller hides real expense records comes down to one habit: you stop trusting the seller’s paper and rebuild the operating picture from outside sources instead, using utility bills, county tax records, insurance quotes, a verified rent roll, and a trailing 12-month cash flow you assemble yourself from bank deposit patterns rather than a summary sheet somebody typed up the week before listing.

The Short Answer

If you’re wondering how to run due diligence on small multifamily when seller hides real expense records, the short version is that you stop asking the seller for permission and start pulling data that exists independently of them. Property tax records live at the county assessor. Utility history lives with the water, gas, and electric providers. Insurance costs live with carriers who will quote the actual property once they know the unit count and year built. None of that requires the seller’s cooperation beyond a signed authorization letter, and none of it can be quietly adjusted the week before closing.

This is for buyers looking at a 6 to 24 unit building where the seller is a private individual or small LLC, not for buyers evaluating institutional-quality assets where audited financials and a third-party property management report already exist. Different animal, different checklist.

The Full Answer

Most sellers who won’t share real expense records aren’t hiding a scandal. They’re usually just disorganized, or the property is owned personally and the “books” are a shoebox and a Schedule E filed once a year. Either way, your job during diligence is the same: build a version of the property’s numbers that doesn’t depend on their honesty.

1. Pull the tax records yourself, before you even call the seller’s agent

Every county assessor’s office keeps a public record of a property’s assessed value and tax history, usually going back three to five years, sometimes longer online. This tells you the real property tax number, which is often the second-largest line item on any small multifamily expense sheet after payroll or maintenance. If the seller’s summary claims a tax figure that’s noticeably lower than what the assessor shows, that’s your first flag. It happens more than you’d think, usually because the seller quotes last year’s homestead-adjusted bill instead of the number a new owner will actually pay.

2. Get a signed authorization and go straight to the utility providers

Water, sewer, gas, and electric providers can typically release 12 to 24 months of consumption history for a specific address once the account holder signs a release, or once you’re under contract and request it as a diligence condition. This single document does more to expose a fabricated expense sheet than almost anything else, because utility usage tracks occupancy and mechanical condition in a way that’s hard to fake. A building claiming 96% occupancy with water usage that looks like a half-empty building is telling you something the seller’s spreadsheet won’t.

3. Verify the rent roll against actual bank deposits, not the seller’s list

A rent roll is a promise. Bank deposits are a fact. Ask for 90 days of bank statements showing rent deposits and match them line by line against the unit list. What surprised me the first time I walked a small building through this exercise was how often two or three units on the “rent roll” simply never show up in the deposits, meaning they’re vacant, delinquent, or occupied by a friend or family member paying nothing. That single mismatch changes your whole gross income line, which changes everything downstream.

4. Get an independent insurance quote before you finalize your model

Insurance carriers can typically turn a quote for a small multifamily property in 24 to 48 hours once you provide unit count, year built, construction type, and roof age. This gives you a real number instead of the seller’s stale premium, which might reflect a policy written eight years ago under different underwriting standards. On older buildings, especially anything with knob-and-tube wiring or a roof past 20 years, we’ve seen quoted premiums come in meaningfully higher than what the seller reports, and that gap alone can move a deal from workable to not workable.

5. Build a bottoms-up expense ratio and compare it to category norms

A stabilized small multifamily property (think 6 to 24 units, garden-style or walk-up) typically runs total operating expenses somewhere in the range of 40% to 50% of gross scheduled rent, excluding debt service. This is an illustrative industry range, not a guarantee for any specific property. If a seller’s summary shows expenses at 28% of gross rents, ask yourself what’s missing: usually it’s a management fee that was never charged because the seller self-manages, deferred maintenance that hasn’t hit the books yet, or a reserve line that simply doesn’t exist. Rebuild the ratio from your independently sourced numbers (tax, insurance, utilities, a realistic repairs and maintenance figure, and a management fee even if you plan to self-manage) and compare that to the seller’s claim.

6. Walk the property with someone who’s rehabbed small multifamily before

Paper only tells you so much. A property manager juggling three small buildings across town can usually walk a 12-unit and tell you within an hour whether the “$400 a month in maintenance” the seller claims is anywhere close to real, just from the smell of the boiler room and the condition of the parking lot asphalt. We tried skipping a physical walk once on a deal that looked clean on paper. It cost us two extra weeks of renegotiation once the roof turned out to be original to a 1987 build. That was a mistake, and it’s why the walk-through happens before the number gets finalized, not after.

“The sellers who won’t share real books usually aren’t lying to you on purpose. They just never kept books worth sharing. Treat every summary sheet as a starting theory, not a fact, and go verify it against something the seller doesn’t control.” – David Stern Team

When the Answer Is Different

Everything above assumes a straightforward small multifamily deal where the seller is a private owner. A few situations change the playbook.

If the property is bank-owned or coming out of a foreclosure, there may be no seller cooperation at all, and you’re working entirely from public records and your own inspection from day one. That’s actually simpler in some ways, because you never had false expectations of getting real books to begin with.

If the property already has professional third-party management in place, ask for the management company’s trailing statements directly, with the seller’s permission. A licensed property manager typically keeps a real general ledger, and that document carries far more weight than anything the owner hands you personally. This is for buyers evaluating a managed asset, not for the classic mom-and-pop fourplex where the owner collects rent checks by hand.

And if you’re buying with partners or raising capital from friends and family for the deal, the standard should be even higher, not lower, because you’re not just underwriting for yourself anymore. This is how I look at deals, not investment advice, but I’d never present a rebuilt-from-scratch T-12 to partners without flagging clearly which numbers are verified against a third-party source and which are still estimates.

For readers who want to see how we structure this kind of underwriting model start to finish, our multifamily underwriting checklist walks through the same verification order used above, and our deal evaluation framework covers how to weight a rebuilt T-12 against your offer price. We also lean on modeling tools built through 8ight to keep the independently sourced numbers separate from the seller’s claims until both sides reconcile, which makes it much harder to accidentally let an optimistic assumption slip into a final model.

Our Take After Years of Underwriting Small Multifamily Deals

The thing buyers overweigh is the seller’s summary sheet itself. It gets treated like evidence when it’s really just a claim. The thing that actually matters is whether you can rebuild the same story from sources the seller doesn’t control. If your independent numbers land close to what they told you, great, that’s a real signal of an honest deal. If they don’t, you now have leverage in the price negotiation instead of a surprise after closing.

Honestly, I didn’t fully trust bank deposit verification until I saw how often it catches phantom units on a rent roll. It’s a slower process than just accepting a spreadsheet. It’s also the difference between underwriting a real building and underwriting a story someone told you about a building.

If I’d tell a friend one thing, it’s this: never let deal urgency shrink your diligence window. A seller who pressures you to close fast specifically because “the numbers speak for themselves” is telling you, indirectly, that the numbers might not survive a slower look. Integrity in a deal usually shows up as patience, not speed. We also close on Shabbat every week regardless of where a deal sits, and no closing timeline has ever been worth moving that.

FAQ

Can I still close on a small multifamily deal without seeing the seller’s actual books?

Yes, buyers close on small multifamily deals without seller-provided books regularly by rebuilding a trailing 12-month operating statement from county tax records, utility providers, insurance quotes, and 90 days of bank deposits. The rebuilt version becomes your underwriting basis instead of the seller’s summary sheet, and it typically takes one to three weeks to assemble depending on how fast the utility company responds.

How long does a full due diligence period usually take on a 6 to 24 unit building?

A typical due diligence period on small multifamily deals in the 6 to 24 unit range runs 21 to 45 days, though it can be shorter or longer depending on the purchase agreement terms. If the seller won’t share real expense records, ask for the higher end of that range so there’s time to pull assessor records, utility history, and an insurance quote before your contingency period closes.

What’s a normal expense ratio for a small multifamily property?

A stabilized small multifamily property typically runs total operating expenses (excluding debt service) somewhere between 40% and 50% of gross scheduled rent, as an illustrative industry range rather than a guarantee. If a seller’s numbers show expenses well below that, around 25% to 30%, treat it as a flag worth investigating rather than good news, since it often means a management fee or maintenance reserve is missing from the summary.

Should I hire a third party to run this verification for me?

A real estate attorney or a CPA experienced in multifamily can review bank statements, tax records, and lease files during your diligence period, and many small buyers use one for the rent roll and bank deposit cross-check specifically. This is worth the fee on any deal over roughly eight to ten units, where the dollar exposure to a missed vacancy or fabricated expense line grows quickly. This is not investment advice, just a practical observation from how these deals typically get structured.

Sources

1. Rental property recordkeeping and reportable expenses – IRS Publication 527, Residential Rental Property
2. Utility consumption benchmarking guidance for buildings – ENERGY STAR Portfolio Manager, US EPA
3. Multifamily market and expense trend research – Freddie Mac Multifamily Research
4. Property assessment and public tax record standards – International Association of Assessing Officers

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