How to Analyze a Rental Arbitrage Deal Before You Sign

A lease is a 12-month commitment and usually a personal guarantee. The only thing that makes signing one a reasonable bet is running the numbers before you do, not after.

1. Pull comparable listings for the unit

Search Airbnb for the neighborhood, set your dates to flexible, and filter by the guest count your unit would sleep. Look at what similar units are actually charging and how booked they appear, not the asking rate of the one listing you happen to like. This is the same comparable-revenue check any operator runs before touring a second time.

2. Estimate average daily rate and occupancy

From those comparables, estimate a realistic average nightly rate and a realistic occupancy percentage, not the best-case numbers from a single busy weekend. Occupancy swings by season and by how new your listing is on the platform, so lean conservative on your first pass.

3. Work out your break-even occupancy

Monthly rent is a fixed cost whether you have one guest or thirty nights booked, which makes break-even occupancy the single most important number in this analysis. Divide the rent you'd owe by your estimated nightly rate to see roughly how many nights a month you need booked just to cover it, then compare that to the occupancy you estimated in step 2.

4. Add the real operating costs

Rent is only one line. Furnishing, cleaning between guests, utilities, supplies, and platform fees all come out of revenue before anything is profit. A deal that only pencils out before these costs is not a deal, it's a rent payment with extra steps.

5. Check the spread

Once you have a realistic revenue estimate and the full cost picture, compare projected monthly short-term revenue against the long-term rent. As a rule of thumb, look for a realistic monthly short-term revenue at least 2–3× the long-term rent so the margin can absorb a slow month, a vacancy, or an unplanned repair. If the spread is thin before you've even accounted for furnishing and turnover costs, it won't survive contact with a real month.

6. Confirm legality and permission before you sign, not after

Call the city's planning or licensing office directly to confirm short-term rentals are allowed at that address, and get the landlord's permission to sublease in writing. Neither of these is optional, and both are far cheaper to check now than to discover after a lease is signed.

FAQ

What's the fastest free way to estimate a deal?

Search Airbnb for comparable listings in the same neighborhood with flexible dates and the same guest count, and note the rates and apparent booking activity. It costs nothing and takes a few minutes, and it's the same first check most experienced operators run before going any further.

What counts as a good spread between revenue and rent?

A realistic monthly short-term revenue of at least 2–3× the long-term rent is a reasonable floor, since that cushion is what absorbs a slow month, cleaning and furnishing costs, and platform fees while still leaving real profit. Below that, a single bad month can erase the margin entirely.

Do I need a lawyer to review the lease?

It's not required, but a real estate attorney reviewing a sublease-friendly lease before you sign is a small, one-time cost against a 12-month commitment and a personal guarantee. Many operators skip this step on their first deal and add it once they understand what it's protecting against.

How does a deal calculator make this faster?

RentingRadar's deal calculator runs this same math, comparable revenue, break-even occupancy, and cost of rent, furnishing, and operations, in one place and scores the result with a Deal Temperature, so you can see at a glance whether a specific unit is a slam-dunk or a no-go before you spend more time on it.

For a deeper framework on picking the market itself, before you get to any specific unit, see how to find a market that allows rental arbitrage.