Rent is prorated as of the closing date so each party — seller and buyer — keeps the rent attributable to the days they owned the building. The mechanic is simple in concept, mechanical in execution, and the source of more closing-statement disputes than the simplicity suggests. The treatment of rents collected, rents owed, prepaid rents, and partial-month rents all happens through the proration calculation, and getting it wrong by even a few thousand dollars produces post-close friction neither party wants.
The default rule, expressed in one sentence: rents collected through the closing date belong to the seller for the days through close and to the buyer from close forward. Rents not yet collected are credited to whichever party will receive them when they do come in.
Take a building with $40,000 in monthly rent that closes on the 15th of a 30-day month. The seller has collected the rent for that month on the 1st. At close:
The buyer receives a credit on the closing statement for their share. The seller keeps the original rent collection from the 1st. Net effect: each party ends up with the rent attributable to their ownership days.
The same calculation runs in reverse if the seller had not collected the rent for that month — the buyer takes occupancy with the right to collect the full month's rent, and the seller is credited for the seller's share.
The proration typically includes:
What's not included in the proration:
The hardest part of rent proration is treating rents the seller has not collected as of close. Three structures are common, each with different implications.
No credit to seller for uncollected delinquent rent; buyer's responsibility to collect after close. The seller is credited only for rent actually collected through close. Uncollected rent — including rent technically owed for the seller's ownership period — is not credited to the seller on the closing statement. If the buyer collects the delinquent rent post-close, the buyer keeps it. This is the cleaner structure for the buyer and the worse structure for the seller. Most institutional buyers prefer it.
Seller credited for uncollected delinquent rent; buyer obligated to remit to seller after collection. The seller is credited at close for all rent technically owed through close, regardless of collection status. If the buyer later collects delinquent rent, the buyer remits the seller's share to the seller. This structure is better for the seller but creates post-close administration. It also creates an awkward dynamic where the buyer is collecting money to forward to a former owner, sometimes from tenants the buyer is also trying to maintain a relationship with.
Hybrid: seller credit for delinquent rent up to a defined limit, with buyer's right to collect anything beyond. A middle structure where the seller is credited for, say, the most recent 30 days of delinquent rent but not older delinquencies. The buyer assumes responsibility for older delinquent collections.
The right structure is negotiated as part of the purchase contract, not at the closing table. Sophisticated buyers and sellers address rent proration treatment in the purchase contract's closing-statement provisions.
For mixed-use buildings with retail tenants paying percentage rent or for apartment buildings with concessions (free rent on lease-up, etc.), the proration becomes more complex.
Percentage rent. Retail tenants paying base rent plus a percentage of sales above a breakpoint produce rent that's calculated quarterly or annually based on the tenant's sales. The proration handles the base rent normally and accrues the percentage rent component pro-rata through close based on year-to-date sales as of the closing date. The buyer pays the tenant whatever percentage rent is owed at the next reconciliation cycle and receives a credit from the seller at close for the seller's share.
Free-rent concessions. A tenant in month two of a 12-month lease with two months of free rent has effectively prepaid by accepting the concession. The proration should reflect that the tenant's "real" monthly rent is the contract rent times 10/12 (12 paid months in a 12-month lease with 2 free). Buyer typically receives a credit at close equal to the unearned portion of the concession.
For buildings with NNN or modified-gross retail tenants paying their share of CAM, taxes, and insurance, the proration includes year-to-date estimated CAM contributions and a forward reconciliation obligation. The closing statement reflects estimated CAM contributions through close. The actual reconciliation happens after year-end when the seller's and buyer's actual operating costs are known, and any over- or under-collection is reconciled retroactively.
For most pure residential multifamily buildings (no NNN tenants), CAM reconciliations are not part of the proration. They become relevant only for mixed-use buildings with retail components.
Property tax is prorated separately from rent and follows California's fiscal year cycle (July 1 to June 30). The seller is responsible for property tax through close; the buyer is responsible for property tax after close. Because California tax bills are issued in two installments per year (due November 1 and February 1), the proration calculation accounts for which installments have been paid by the seller and which remain to be paid by the buyer.
Special assessments (Mello-Roos, HID, local improvement districts, soft-story retrofit financing if applicable) prorate similarly to property tax — based on the period covered.
Three things matter most.
Clean rent roll, current at close. The rent roll has to be accurate to the dollar as of the closing date. Every tenant, every rent charge, every concession, every late fee. The buyer's audit will catch discrepancies, and discrepancies in the seller's favor will be challenged. Discrepancies against the seller's interest will be silently corrected.
Trust accounting that ties to the rent roll. The trust account or operating account that received the rent collections should reconcile to the rent roll. Where money was collected but not posted to the tenant ledger, the closing statement gets confused. Pre-close cleanup of these discrepancies is meaningfully cheaper than at-close cleanup.
Documented delinquency status. For every delinquent tenant, the seller should have documented the delinquency status — what was owed, what was paid, what the current arrears balance is. This drives the negotiation of how delinquent rent is treated in the closing statement.
Rent proration is mechanical when the records are clean and contentious when they aren't. The buyer's closing statement is going to reflect the rent attributable to each ownership period; the question is whether that statement matches the seller's expectations or surprises them. Sellers whose rent roll and trust accounting are current and reconciled have predictable closing statements. Sellers whose records are stale or messy spend the last week of escrow arguing about line items that should have been resolved months earlier.
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Michael Sterman is Senior Managing Director Investments at Marcus & Millichap, specializing in Los Angeles multifamily transactions.
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