Proper AI

It's the last Friday of the month, somewhere in a regional property manager's inbox, and a thousand small numbers are misbehaving. Rent that arrived in two payments. A water bill that posted twice. An owner who wants their statement before noon. Across the country, in a quiet office on Kearny Street, Proper AI is already done with it.

This is what Proper does. Not the pitch deck version - the actual job. Reconciliation. Owner statements. The grim, granular accounting work that keeps a 5,000-door portfolio from quietly catching fire. The company calls it "property accounting." Its customers call it "the thing I never want to do again."

Founded in 2017 by Mark Rojas, Proper now employs around 320 people across a remote-first team, with engineering and product in San Francisco and a globally distributed accounting bench. It has raised roughly $44 million from QED, MetaProp, Expa, Bling Capital, FJ Labs, Vesey Ventures and a small chorus of others. None of which matters to the property manager waiting on Tuesday's owner statement. What matters is that the statement arrives.

The Problem They Saw

Property accounting is an industry that hides in plain sight. Roughly $300 billion in annual US rent flows through ledgers maintained, in many cases, on software that pre-dates the smartphone. The job sits at an awkward intersection: bigger than a bookkeeper can handle, smaller than a Big Four firm cares about, weirder than a generic outsourcer can stomach.

The traditional fix has been an in-house accountant - one for every few thousand units, salaried, benefits-paying, prone to leaving in Q4. The cost of a single in-house property accountant runs north of $90,000 fully loaded. The output, on a good month, is a clean trial balance.

Proper looked at that math and asked an uncomfortable question: what if the work didn't actually require a person sitting one floor up from the leasing office? What if reconciliation was, at the end of the day, a pattern-matching problem - the kind machines now happen to be unusually good at?

The Founders' Bet

Mark Rojas grew up around New York real estate. Family ties to property, the kind of childhood where you learn what a sub-ledger is before you learn to drive. He spent years away from it - leading design and product at Shopular, a Sequoia-backed shopping app - before returning to the industry he understood by birthright.

His bet was unfashionable in the way the best bets often are. While the rest of proptech was racing to build slicker dashboards, Rojas wagered that the real opportunity was the boring part: the back office. Not a new accounting platform - the world has enough of those - but a service layer that ran on top of every accounting platform already in use.

It was a service business pretending, briefly, to be a software company - and then a software company pretending, just as briefly, to be a service business. The truth, as usual, was both. Investors took some convincing. QED, the fintech specialist that has bankrolled Credit Karma and Nubank, eventually led the $9 million Series A in 2021. A Series B followed in August 2024.

What the Thing Actually Does

Proper plugs into Appfolio, Buildium, Entrata, MRI, NetSuite, Yardi and the rest of the property management cinematic universe. Then it does the unglamorous work: bank reconciliation, accounts payable, accounts receivable, owner statements, month-end close, audit prep. The machine handles the rote pattern matching. A trained accountant handles the exceptions. The customer gets the deliverable.

The Proof

Customers come in two shapes. Small operators with 250 doors who can't justify a full-time controller. Large institutional managers with 50,000 doors and 15 million square feet of commercial space who can - but who would rather not. Proper services both, which is the kind of range a pure SaaS company rarely manages.

The partner roster reads like a who's who of the property tech stack: Appfolio, Buildium, Yardi, Entrata, MRI, NetSuite. Proper does not compete with them. It sits next to them, doing the thing they were never built to do.

QED Investors - which has historically backed companies that handle other people's money for a living - bet on Proper because the unit economics worked at both ends of the market. Revenue today sits in the neighborhood of $37 million. Not unicorn velocity. But unicorn velocity is, increasingly, last decade's metric.

The Mission

Proper's official mission is unfussy: cut property accounting costs without sacrificing accuracy or control. Read it twice and the interesting word is "control." Outsourcing has a reputation for what gets lost in translation. The Proper pitch is the opposite - more control, not less, because the books are visible, structured, and updated in real time rather than buried in a spreadsheet on someone's laptop.

The longer-term mission is even simpler: make real estate's back office disappear. Not abolish the accountants - they are explicitly part of the operating model - but abolish the friction. Get the work done, get the statements out, get the owner off the phone, get the property manager back to managing properties.

Why It Matters Tomorrow

The interesting story isn't whether Proper wins the property accounting market. It is whether the model - software plus a structured human team, billed as a service, sold by deliverables rather than seats - turns out to be how every messy back-office category eventually gets solved. Legal ops. Insurance claims. Healthcare billing. They all rhyme.

The proptech press calls this category "services-as-a-software." It is an awkward phrase. It is also probably the right one. Pure software ran out of unsexy verticals to disrupt years ago. The next ten years belong to the companies willing to absorb the human work too.

Proper isn't betting on a future where the accountants are gone. It is betting on a future where the accountants are augmented, distributed, and dramatically less expensive per door under management - which, for the property manager waiting on Friday afternoon, is a future that already arrived.

Back in that regional property manager's inbox. The thousand small numbers have, somehow, behaved. Rent is reconciled. The water bill posted once. The owner got her statement at 11:47 AM, well before noon. Nobody noticed. Which is exactly the point.

That is what Proper AI sells. Not software. Not labor. Not even, really, accounting. It sells the absence of a problem. And the absence of a problem, it turns out, is one of the few things the property management industry has been willing to pay handsomely for.