Updated June 22, 2026
The honest answer is the one no website wants to give you: you cannot get a real number for your building online, and any tool that hands you one is guessing. Not because the math is secret — because the inputs that decide your building's value are specific to your rent roll, your tenants, your vintage, and your block, and none of those live in a formula.
That doesn't mean you're flying blind. It means you should understand what actually drives the number, so that when you get a real valuation you can tell whether it's honest. Here's what determines what your LA apartment building is worth — and why the figure that matters comes from a broker who has read your rent roll, not a box you typed numbers into.
Across the 254 buildings I've closed in Los Angeles, the price per unit ranges from about $136,000 in Panorama City to $617,000 in Santa Monica — a 4.5x spread inside one county. And the range within a single submarket is often just as wide: in Sherman Oaks alone, my closings span roughly $130,000 to $486,000 per unit. The Sterman Transaction Index lays the full picture out, submarket by submarket.
Sit with that for a second. If buildings on the same streets sell for three and four times different per-unit prices, then any "average" number — the kind a calculator multiplies — is not just imprecise. It's actively dangerous, because it anchors you to a figure your building may be nowhere near, in either direction. Owners who price off a generic number leave money on the table or chase a price the market will never pay.
Four things move the number far more than your zip code does:
1. Legal in-place income — not market rent. A buyer underwrites what your building legally earns today, not what it could earn if every unit reset to market. On a rent-stabilized building, the gap between the two is not money you can capture on your schedule. This is the single biggest input, and it's why two buildings with identical "market rents" can be worth very different amounts. (More on this in how to read a rent roll.)
2. Rent-control exposure. A pre-1978 LA City building is capped under the RSO — a 4% ceiling as of July 1, 2026 — which limits how fast its income can grow. A post-February-1995 building is Costa-Hawkins-exempt and isn't. Buyers pay a real premium for the building whose income can move, which is why the pre-1978 vs. post-1995 gap keeps widening.
3. Condition. Deferred maintenance is a dollar-for-dollar deduction from offer price. A roof, plumbing, or seismic retrofit that's coming due is money straight off your number — and a buyer's inspector will find it whether you disclose it or not.
4. Submarket and unit mix. Location sets the floor; the size and composition of the building shape what a buyer will pay per door. Smaller buildings carry a higher per-unit price; larger ones price for the operator.
A real valuation isn't a calculator — it's analysis. A broker looks at your legal in-place income, applies the cap rate and gross rent multiplier that recent, genuinely comparable closed sales in your submarket are actually printing (not asking prices, not listings), adjusts for your building's condition and rent-control status, and pressure-tests it against the live buyer pool. That's a Broker Opinion of Value, and a good one shows you the comparable sales behind every number — not adjectives. (How to read one without getting played.)
The reason it can't be automated is the reason it's worth doing: the inputs require judgment about your specific building, and the comps require someone who closed deals like yours, near yours, recently.
If you're seriously weighing a sale, the move isn't to find a better calculator. It's to get an honest Broker Opinion of Value from someone with recent closings in your submarket, and to understand what's driving the number so you can hold them to it. If your building needs work first, maximizing value before listing is where to start; if you're ready to know your real number, that's a conversation.
How much is my apartment building worth in Los Angeles?
It depends on your building's legal in-place income, its rent-control status, condition, submarket, and unit mix — not on a generic per-unit average. Across recent closed LA sales the per-unit price ranges from roughly $136,000 to $617,000 depending on submarket, and just as widely within a single neighborhood, so a real number requires a building-specific Broker Opinion of Value.
Can I value my apartment building with an online calculator?
No tool can give you a reliable number, because the key inputs — your legal in-place rents, rent-control exposure, condition, and genuinely comparable recent sales — require judgment specific to your building. A calculator's "average" will anchor you to a figure your building may be far from in either direction.
What's the most important factor in my building's value?
Legal in-place income — what the building lawfully earns today — combined with how fast that income can grow under rent control. Buyers underwrite the income they can actually collect, not the market rents on a pro forma.
How do I get a real valuation?
Through a Broker Opinion of Value from a broker with recent closings in your submarket, who shows you the comparable closed sales behind the number. That's a conversation, not a form.
The owners who get the most for their building aren't the ones who found the best calculator. They're the ones who understood what drives the number and got an honest read from someone who has actually sold buildings like theirs. When you want your real number — backed by real comps, specific to your building — start the conversation.
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