Short-Term Rental Rules by Market: Why Financing Doesn’t Make the Rental Legal

A borrower closes on a two-unit rowhouse in Brooklyn planning to run both units as whole-apartment Airbnb listings. The pro forma says $9,000 a month in combined gross short-term revenue at a conservative occupancy assumption. Six weeks after closing, the city’s short-term rental registration office makes clear that neither unit qualifies: under New York City’s Local Law 18, a short-term rental under 30 days requires the host to be present in the unit during the stay and the unit to be registered with the Mayor’s Office of Special Enforcement. Two non-owner-occupied units in a rowhouse the owner doesn’t live in don’t meet that bar. The Airbnb plan is dead on arrival, and the deal now has to stand on long-term rent alone.

This is not a financing failure. It’s a sequencing failure. The loan was sized to a revenue model the jurisdiction wouldn’t permit, and nobody checked the local rule before the number went into the file. Financing a deal doesn’t make the short-term rental legal, and a DSCR file priced off illegal income is a file that gets re-underwritten the hard way, after the money has already changed hands.

What Actually Varies by Market

Short-term rental rules aren’t a single national standard — they’re set city by city and sometimes block by block, and they change the available revenue model in ways that matter to the loan, not just to the host:

• New York City (Local Law 18): stays under 30 days require host presence and city registration. A non-owner-occupied unit generally can’t legally run as a short-term rental at all — it has to be priced as a 30-day-plus or long-term rental instead.
• Nashville/Davidson County: non-owner-occupied (NOO) short-term rental permits have been capped and largely unavailable in residential zones since the city stopped issuing new ones outside specific zoning districts. A property without an existing, transferable NOO permit typically can’t be bought and legally operated as a non-owner short-term rental — new owners are left with owner-occupied rules (which require the buyer to actually live there) or no short-term option at all.
• Parts of New York and New Jersey: some municipalities require proof of a current local registration or permit before our lending partners will underwrite any portion of the DSCR income as short-term revenue. No permit in hand at closing means the file gets priced as a long-term rental, full stop, regardless of what the listing platform shows the unit could earn.

The Arithmetic: What the Local Law Actually Costs

Here’s the Brooklyn example worked through to the number that matters — the DSCR the lender can actually use:

A 1.65x DSCR clears almost any program comfortably. A 0.93x DSCR still clears some DSCR tiers that go down to 0.75x, but only at a leverage cut — a smaller loan amount, a higher rate, or both. The $1,300-a-month gap between the two income figures is the entire difference between a deal that works at the requested loan amount and one that needs to be resized before it closes. That gap exists because of a zoning and registration rule, not because of anything wrong with the property or the borrower’s credit.

Why This Is a Lending Question, Not Just a Hosting Question

Our lending partners size a DSCR loan off income the appraiser can support, and an appraiser asked to credit short-term rental income on a property that can’t legally be operated that way has nothing defensible to put in the file. That’s why, in a market with an active registration requirement, the underwriting file increasingly asks for the permit or registration number up front rather than waiting for a post-closing surprise. If the jurisdiction hasn’t settled its own rules yet — several New Jersey towns revisit their short-term rental ordinances year to year — the file gets priced conservatively, on the long-term number, until there’s something concrete to point to.

What to Check Before You Make an Offer

Before a short-term rental purchase goes under contract in any of these markets, confirm three things: whether the specific unit type (owner-occupied vs. non-owner-occupied) is legally permitted to run short-term stays at all, whether an existing permit transfers with the sale or has to be reapplied for, and whether the HOA or condo association has its own rental-term minimum that’s stricter than the city’s. Any one of those can turn a short-term rental pro forma into a long-term rental file overnight, and the loan amount needs to be able to survive that outcome before you sign.

When This Is the Wrong Call

If the deal only clears at the short-term revenue number and the property doesn’t yet have a confirmed, transferable permit in a capped market like Nashville, or sits in a non-owner-occupied configuration in a market like NYC that doesn’t allow it, don’t buy expecting to argue your way into short-term operation later. Underwrite the purchase to the long-term rent you can prove today. If it doesn’t work at that number, either pass on the deal or target a market where non-owner-occupied short-term rental is clearly and currently legal. Note that some markets’ short-term permits are reserved for owner-occupants only — that permit path belongs to buyers living in the property themselves, which sits outside a non-owner-occupied investment loan altogether and isn’t a workaround this financing supports. Financing the purchase was never the hard part — getting the right to operate it the way the pro forma assumed is.

Easy Lending USA matches short-term rental and DSCR deals with lending partners who underwrite against the income a property can legally produce — see current short-term rental loan parameters, or get a specific deal checked before you make an offer at Airbnb & short-term rental loans — check your deal. For how short-term income gets treated on the DSCR calculation itself once it is legally usable, see short-term rentals under DSCR, and current indicative pricing is on the rates page. All figures above are indicative and subject to underwriting; local short-term rental rules change and should be confirmed with the municipality directly before closing.