Why multi-family deals die over a single tenant
The pattern is familiar. The good units pay, the building is sound, and one occupant is the reason three deals have fallen through. By the third failed contract the multi-family house has days on market attached to it and a story that follows it around.
We are not going to lose interest over one unit. Tell us which one it is and what is happening in there, and we factor it in rather than walk.

Multi-family conversions, certificates of occupancy and lenders
Undocumented conversions are common enough on Long Island to be ordinary, and they become a problem at exactly two moments: when the municipality takes an interest, and when you try to sell. A buyer with a mortgage generally cannot close on a multi-family property that is not what the records say it is.
We can. We buy the house as it exists, deal with the legalization or the reversal ourselves afterward, and never ask a seller to resolve a conversion issue before closing.
Why local knowledge changes the number
A six-bedroom on Gladstone Avenue. A four-bedroom on Storey Avenue. A three-bedroom on Montauk Avenue. All of them in Islip, all bought by us.
Islip is roughly 18,418 people in Suffolk County, ZIP 11751, and the housing stock is mostly colonial, cape cod, ranch. Around Main Street and Sunrise Highway, most of it is old enough that the mechanicals are on their second or third life. The Islip stop pulls buyers who commute, which supports the good houses and does very little for the ones that need a roof. We have bought enough here to know which streets take water, which blocks still have oil tanks in the ground, and what the Islip Union Free School District does to a resale price.
Some units paying, some not
Send the rent roll as it truly is rather than as it was meant to be. Which units are occupied, what each one pays, who is behind and by how much, what is signed and what never was.
A multi-family house with two paying units and one in arrears is completely normal to us. We price the paying units on what they actually collect and the rest on what it realistically is. Nobody is being asked to make the numbers look better than they are before we make an offer.
What experience with multi-family actually buys you
A multi-family sale is rarely one problem. It is the tenants, the paperwork, the condition and sometimes the municipality, all arriving together, and owners are rarely in a position to project-manage them.
That is the part we are genuinely useful for. We know how a Suffolk County multi-family transaction sequences, which issues a title company will actually raise, and which professional to call when it needs one. We have bought buildings at every stage of this.
What the two paths cost in Islip
These are the two routes open to you with a multi-family property, priced against what Islip houses actually sell for.
Work it against Islip's own numbers. The median sale here is $677,000. A 5% commission on that is $33,850, and seller closing costs of about 2% add roughly $13,540. Those are costs we can cover on our side. That is $47,390 gone before anyone counts the repairs it took to get the house listable.
There are two waits in a listed sale and people usually only count the first. In Islip the median house takes about 35 days to go from listed to a signed contract. Then it waits again, typically 45 to 60 days, while the buyer's lender orders an appraisal and underwrites the loan. Call it 80 to 95 days from sign to keys, assuming nothing goes wrong.
The part worth understanding is what a signed contract actually guarantees, which is less than most sellers assume. A retail buyer with a mortgage contingency can walk away right up to the end. If they do not qualify, if the appraisal comes in under the price, if they change their mind and let the financing lapse. A share of deals die exactly there, after months of waiting, and the house goes back on the market with time on it. We are not borrowing anything, so there is no lender to satisfy, no appraisal to come in low and no contingency to exercise.
| Listing with an agent | Selling to us | |
|---|---|---|
| Sale price | $677,000 (Islip median) | Our written offer |
| Commission | −$33,850 | None |
| Seller closing costs | −$13,540 | We can cover them |
| Repairs before listing | Out of pocket | None |
| Cleanout | Yours | Ours |
| Showings | Until it sells | One visit |
| Listed to signed contract | 35 days (Islip median, once listable) | 24 hours to a written offer |
| Contract to closing | 45 to 60 days (waiting on the buyer's lender) | A date you choose |
| Total wait | 80 to 95 days if nothing falls through | Yours to set |
| Can the buyer walk? | Yes (mortgage contingency runs to the end) | No financing to fall through |
| Before repairs and carrying | $629,610 | The number we put in writing |
For the listing side we have used a 5% commission and about 2% in seller closing costs; your real figures may differ. Repairs and carrying costs are left out because they depend on the house. If yours is in good shape, a good agent may well get you more than we would, and we will tell you if so.
Two of everything, and what that costs
Owners maintain a rented building to the standard of keeping it rented, which is a sensible way to run a multi-family and a poor way to prepare one for a retail buyer. The kitchens are functional, the systems are old, and the whole thing shows its age the moment an inspector walks through.
That gap is exactly where financed sales come apart and exactly where we are comfortable. Tell us plainly what needs doing and it goes into the offer.
What you do not pay when you sell a multi-family property
Every line below is a cost of listing a multi-family property the retail way that simply does not arise here.
- Agent commission
- $33,850 at 5% of the Islip median none
- Seller closing costs
- About $13,540 on a $677,000 sale. We can cover these. none
- Repairs to make it listable
- Whatever it takes to make it listable, paid in advance none
- Cleanout and removal
- Charged by the truckload, and done before the first showing none
- Carrying costs while it waits
- Taxes, insurance and utilities while you spend 80 to 95 days finding a buyer and waiting for their loan none
What a retail sale looks like for a multi-family house
The comparison that matters is our offer against what a multi-family listing actually produces, after commission, after the repairs a buyer demands, after the months of carrying a building with a unit that is not paying.
The median house in Islip sold for $677,000 and took about 35 days to go under contract, then another 45 to 60 days waiting on the buyer's mortgage. That is 80 to 95 days in total, for a house that was ready to show on day one. We will go through both columns with you, and we are not troubled if the conclusion is that you should list.
Common questions
Do you buy two-family and three-family houses in Islip?
Yes. Two-family, three-family and converted houses are a regular part of what we buy, occupied or vacant, and we do not need every unit shown before making an offer.
The conversion was never permitted. Can you still buy it?
That is a condition we price, not a reason to walk away. It does matter to a buyer with a mortgage and to a title company, which is usually why these multi-family houses struggle on the open market and not with us.
One unit pays and one does not. Does that kill the deal?
No. A mixed multi-family is ordinary. Give us the real rent roll and we price the paying units on what they collect and the rest on what the situation actually is.
Can you make an offer if a tenant will not let you in?
We will not ask you to force entry on anybody. Show us what the tenants allow, tell us what you know about the rest, and we will still put a written number on the Islip multi-family.
What happens to the leases and the deposits?
The leases run with the building and the deposits transfer at closing through the attorneys in the normal way. You do not need to reconcile anything with a tenant beforehand.