Scroll through Sausalito listings for an afternoon and you'll notice something that doesn't quite add up. A hillside home with a sliver of skyline view lists north of $3 million. A flat two blocks from the ferry terminal runs $1.5 million to $2 million. Then, tucked at the northern edge of town, a floating home on Richardson Bay comes up for $650,000, comparable square footage, comparable proximity to downtown, a fraction of the price.
For a buyer comparing Marin towns on a spreadsheet, that floating home looks like the deal of the county. It isn't, and the reason has nothing to do with the structure itself. It has to do with a piece of state law signed ten months ago that ties your future rent to the exact number you and a seller agree on at closing.
Three Different Markets Wearing One ZIP Code
Sausalito's housing stock splits into three distinct products, and each one prices differently enough that a single median tells you almost nothing.
Hillside homes, the mid-century and contemporary builds terraced into the slopes above town, command the steepest premiums in the city. Unobstructed San Francisco skyline views and the engineering required to build safely on that grade push recent sales into the $3 million to $5 million range and beyond. Downtown waterfront homes and flats, the ones within walking distance of Bridgeway's restaurants and the ferry landing, typically trade from the mid $1 millions to just above $2 million, with land value often mattering more than interior square footage given how tight those lots run.
Then there are the floating homes at Sausalito's four Richardson Bay marinas: Waldo Point Harbor, Kappas Marina, Yellow Ferry Harbor, and Commodore Marina. Prices there span roughly $400,000 for a smaller, older float to $1.8 million for a premium multi-level home with a deep-water berth and high-end finishes. Waldo Point Harbor alone operates 282 berths at the northern end of the bay, and by the marina's own account every one of them has stayed occupied since the 1970s.
That price gap is real, but it isn't the whole story. What a floating home buyer owns is the structure. What they don't own is the water underneath it, and that distinction is where the actual cost of ownership starts to diverge from the listing price.
The Split You're Actually Buying Into
Every floating home purchase in Sausalito involves two separate transactions happening at once. You buy the house. You separately lease the berth, the physical slip of water and dock access, from whichever marina holds that parcel. The berth lease sets your monthly fee, your parking rights, your maintenance obligations, and critically, how and when that fee can change.
Starting in 2022, that lease relationship in Marin was governed by AB 252, a state law that capped annual berth rent increases at 3 percent plus the change in the cost of living, or 5 percent, whichever was lower, across three counties: Alameda, Contra Costa, and Marin. The problem was that Marin never fit that mold. The county holds 425 of the floating homes covered by that law, compared with 42 in Alameda County and 11 in Contra Costa. A rule built for a handful of scattered docks elsewhere in the Bay Area was governing the vast majority of California's floating home stock, and both residents and marina owners in Sausalito said so.
That mismatch is what produced AB 754, a Marin-only amendment to the Floating Home Residency Law that Governor Newsom signed on October 10, 2025. It didn't arrive as a surprise fix from Sacramento. The Floating Homes Association's Legislative Action Committee spent more than two years negotiating directly with the marina owners before bringing a compromise to the legislature, one that passed the Assembly and Senate without a single dissenting vote. Before that, the association polled its own residents, and more than 400 people responded, with 93 percent voting to support the new terms.
What the New Formula Actually Does
AB 754 replaced the flat AB 252 cap with a cost-of-living formula: annual berth rent increases are now indexed to CPI with a 3 percent floor and a 7.5 percent ceiling, and any CPI reading above 5 percent gets cut in half before it's applied. That part mostly benefits current owners by smoothing out volatility.
The part that matters more for a buyer is what the law calls an "in-place transfer." If a floating home carries a lease of 10 years or longer and it sells, the marina is allowed to reset the new owner's rent, but only within a specific ceiling:
The increase is capped at whichever is lower: 25 percent above the previous rent, or 0.15 percent of the home's certified final sale price.
Read that again, because it's the mechanism the listing price never discloses. The sale price you negotiate with a seller doesn't just set the comps and the transfer paperwork. It becomes an input in the formula that sets your own monthly berth fee going forward. Buyers are required to certify that final sale price to the marina in writing, under penalty of perjury, which tells you how seriously this number gets treated on the dock.
Run the math on a mid-range purchase. A floating home sells for $1.5 million. Zero point one five percent of that is $2,250 a month. If the prior owner's rent was $2,000, the 25 percent cap would only allow an increase to $2,500. The marina is required to charge whichever number is lower, so in this case the sale-price formula and the percentage cap land close together, and the buyer's new rent settles somewhere in that range depending on which one actually binds.
Now imagine a home with a much lower legacy rent, say $1,200 a month, selling for that same $1.5 million. Twenty-five percent above $1,200 is only $1,500. The sale-price formula would allow $2,250, well above that. Here the percentage cap protects the buyer, and the marina is limited to $1,500 regardless of what the home sold for.
The point isn't to hand you a formula to memorize. It's that two floating homes at the identical sale price can produce two very different rent outcomes depending entirely on what the previous owner was paying, and that variable rarely shows up anywhere on a listing sheet. It shows up in the lease.
Financing Follows the Same Logic
The berth lease structure also explains why floating home financing looks nothing like a conventional mortgage. Only a small pool of lenders write these loans at all. Bank of Marin, with a branch in Greenbrae, offers floating home financing with local underwriting, a credit decision within 72 hours of a complete application, loan amounts up to $1,000,000, and eligibility limited to single-unit homes with a concrete hull. Cooperative Center Federal Credit Union is one of the few other institutions active in this niche.
Down payments on floating homes typically run higher than on land-based homes, often in the 20 to 25 percent range versus 10 to 15 percent for a conventional purchase, and interest rates commonly sit one to two percentage points above what a comparable land mortgage would carry, with shorter amortization schedules as well. Part of that comes down to classification. Marin assesses floating homes as real property for tax purposes, which gives owners standard homeowner tax treatment, but the financing side still treats the structure and the leased berth as a more complex asset than a fee-simple house on a foundation. Lenders price that complexity in.
Why This Changes the Comparison
None of this means a floating home is a poor choice for a Sausalito buyer. It means the sticker price answers a different question than the one most buyers think they're asking. A $650,000 floating home and a $1.5 million downtown flat aren't two points on the same cost curve. One carries a monthly berth fee that can reset the moment you buy it, tied to a formula built into state law less than a year old. The other doesn't.
If you're comparing Sausalito against another Marin waterfront option, or comparing a floating home against a hillside property in the same city, the honest question isn't just what's the price per square foot. It's what happens to your monthly cost the day you close, and whether the lease you're inheriting has already been converted to the new 10-year terms the law now favors.
A Few Direct Questions
Does AB 754 apply to every floating home in Sausalito, or only some? It applies to any floating home marina located in Marin County, which covers all four Sausalito marinas. The specific rent outcome for an individual sale still depends on the lease terms attached to that particular berth, so this is a document you confirm before writing an offer, not after.
If I'm not planning to sell soon, does any of this matter to me as a buyer today? Yes, because you're the one who will eventually be on the other side of an in-place transfer when you decide to sell, and the rent your buyer inherits affects how your home shows against comparable floats on the market.
Are floating homes a bad investment because of this? Not inherently. It means the true cost of ownership requires reading the lease and the marina's current rent schedule with the same care you'd give a title report, not treating the sale price as the full picture.
If you're weighing a Sausalito floating home against a hillside property, a downtown flat, or a home in a neighboring Marin town, I'd rather walk you through the actual numbers on a specific listing than leave you guessing at a formula. Raquel Newman can pull the current lease terms, the marina's rent history, and comparable sales across all three Sausalito property types before you make an offer. Request your private market valuation and let's look at what a specific property actually costs to own, not just to buy.
