Picture the due diligence period on a well-kept four-unit building a few blocks off Castro Street. The rent roll looks disciplined. Increases came in steady and on schedule for the past six years, nudging upward a percentage point or two most Augusts. It reads like a landlord who understood the rules and worked them well. An investor underwriting the deal might reasonably assume that discipline is baked into the asset, that the next owner inherits the same trajectory.
That assumption is the part of Mountain View's rent control ordinance that catches buyers off guard. Some of what makes that rent roll look strong does not survive a change in ownership. The seller's rent roll and the buyer's rent roll are not the same document, even though they list the same units.
Which Regime You're Actually Buying
Mountain View voters passed Measure V in November 2016, creating the Community Stabilization and Fair Rent Act, or CSFRA. The ordinance took effect December 23, 2016, and it still governs the city's rent stabilization and eviction rules today. Coverage depends entirely on two facts about the building: how many units it has, and when it was built.
- According to the City of Mountain View's rent stabilization page, multi-family properties with three or more units built before February 1, 1995 are fully covered. That means both a capped annual rent increase and just-cause eviction protection.
- According to RentCheck, multi-family properties with three or more units built between February 1, 1995 and December 23, 2016 get just-cause eviction protection only. No rent cap applies.
For a triplex or fourplex built in, say, 1988, the calculus is entirely different: full CSFRA coverage, a rent ceiling tied to inflation, and an administrative body watching the building's history.
The city's FAQ describes the Rental Housing Committee as five appointed members with rulemaking authority over the ordinance; the Committee meets monthly at City Hall on Castro Street. They set the Annual General Adjustment, the CSFRA's rent cap, based on 100 percent of the change in the Bay Area Consumer Price Index each year. It is not a fixed number. The city's own adjustment history shows how much it moves: 3.4 percent for the 2017 to 2018 cycle, 3.6 percent the following year, 3.5 percent in 2019 to 2020, dropping to 2.9 percent and then 2.0 percent through the pandemic years, before jumping to 5.0 percent for 2022 to 2023. Buyers underwriting a CSFRA-covered building today should confirm the current cycle's figure directly with the city rather than assume a past year's number still applies, since the Committee resets it annually.
For buildings that fall outside CSFRA and instead rely on the statewide AB 1482 backstop, the math runs differently and, in recent cycles, higher. For the twelve months running August 1, 2025 through July 31, 2026, the city's AB 1482 guidance says the cap sat at 5 percent plus the regional CPI of 2.7 percent, for a combined 7.7 percent ceiling, a cycle that has just closed out as of this writing. That's a wider allowance than most CSFRA-covered buildings have seen in a single year, which is worth knowing if you're comparing a pre-1995 triplex against a 2005-built fourplex down the street. Confirm the figure for the current cycle directly with the city before you finalize an income projection. The build date isn't a footnote. It's the variable that decides which ceiling applies to your income projection.
The Number That Doesn't Transfer
Here's the mechanism that makes the opening scenario worth worrying about. Mountain View landlords are allowed to bank unused portions of their annual adjustment and apply them later, as long as the combined increase in any twelve-month window doesn't exceed 10 percent, per the municipal code governing the CSFRA. A landlord who holds rent flat for two or three years while the allowable adjustment accumulates in the background can, in theory, catch up all at once, subject to that 10 percent ceiling.
That banked value can make a rent roll look conservative and full of room to grow. It's tempting to read that headroom as an asset that transfers with the deed. It doesn't. According to the Tobener Law Center, the right to impose a banked increase does not carry over to a new owner when the property changes hands. Whatever cushion the seller built up resets to zero the day title transfers. The next allowable increase for the new owner starts fresh.
If a broker's pro forma leans on "significant upside from historical restraint," that upside likely belongs to the seller's ownership period only. Ask specifically whether any banked increases are reflected in the projected rent growth, and if so, strike them from your model. The city's own rent stabilization materials confirm this is a feature of the ordinance, not an oversight, and it's worth reading the full text of the CSFRA before you finalize an offer on any covered building.
The Frozen Lever You Might Inherit
A second detail rarely surfaces until later in escrow: registration status. Landlords of CSFRA-covered units must register annually with the Rental Housing Committee and pay a per-unit fee. Confirm registration status with the city's landlord resources page as a standard diligence item, the same way you'd confirm property tax status or code violations.
The Utility Line Item Almost Everyone Misses
One more wrinkle for older buildings specifically. In December 2023, the Rental Housing Committee adopted regulations clarifying that utility charges are part of rent for fully covered CSFRA units. The city's frequently asked questions say that buildings that used a Ratio Utility Billing System, splitting a shared water or garbage bill across tenants based on unit size or occupancy, must transition that cost into a fixed rent amount through a one-time landlord petition process, at least for tenancies that started before March 1, 2024. If a seller's income statement shows separate utility reimbursement income for an older tenancy, that line item may need to be folded into rent and run through the adjustment rules rather than treated as pass-through revenue. It's a small detail on a spreadsheet, but it changes how a lender or an appraiser should treat that portion of income. The city's RUBS guidance page walks through the mechanics.
What This Means for the Offer You Write
None of this means CSFRA-covered buildings are bad investments. Mountain View's rental demand, driven by proximity to major employers like Google and LinkedIn, keeps occupancy strong regardless of which regulatory tier a building falls under. What it means is that the number on the seller's rent roll and the number you'll actually be able to charge in year one are two different figures, and the gap between them is defined by build date, banked increases that don't survive the sale, the building's registration status, and utility billing history that may need restructuring.
Before you remove contingencies on any three-plus unit Mountain View property, get specific, current answers on four points: the building's exact construction date and which CSFRA tier applies, whether the seller has any banked increases they're implicitly pricing into the deal, whether registration and fees are current as of the closing date, and whether utility charges for any pre-March 2024 tenancy still run through a RUBS system. None of this is legal or tax advice, and the specific figures the Rental Housing Committee sets change annually, so confirm current numbers with the city and your own attorney before you finalize a purchase price.
A Few Questions Buyers Ask
Does CSFRA apply to a duplex? Confirm the property's classification with the city.
What about a single-family home with an accessory dwelling unit? Confirm the specific configuration with the city.
What should I check about a building's registration before closing? Confirm the building's registration status with the city before closing.
Is any of this legal advice? No. This is a due diligence framework based on public city records and the ordinance text as it stands today. Verify current figures and your specific building's status with the Rental Housing Committee and your own attorney before writing an offer.
If you're evaluating a small multifamily property in Mountain View, or thinking about what a CSFRA-covered building is really worth once the banked increases and registration status are accounted for, Real Smart Group works with builders and investors across the Peninsula on exactly this kind of underwriting. Get your free home valuation and a straight read on what you're actually buying before you write the offer.
