Can You Do Subject To on a Condo
You found a condo with a low-rate loan still attached, the seller needs out fast, and you're wondering if subject-to works the same way it does on a single-family house. It does, with one extra layer you can't skip: the HOA.
Yes, you can buy a condo subject-to the existing mortgage. The deed transfers to you, the seller's loan stays in the seller's name, and you make the payments going forward. That part is identical to any subject-to deal. The difference is the condo association sits between you and a clean closing, and it can create problems a single-family deal never has.
Two things you have to check before you sign anything: the HOA estoppel letter and the association's governing documents. Skip either one and you can end up owning a unit with a lien on it that has nothing to do with the mortgage.
What Subject-To Actually Means Here
In a subject-to purchase, you're not assuming the loan and you're not getting a new one. The existing mortgage stays exactly where it is, under the seller's name and social security number. You take title through a deed, and you start sending the payment every month, either directly to the servicer or through the seller as a pass-through. The loan itself never changes hands.
This works on a condo the same way it works on a house, a townhome, or a duplex. The lender doesn't care what kind of structure is attached to the loan. What changes is who else has a claim on the property.
Why the HOA Is the Real Complication
A single-family home has one lien to worry about: the mortgage. A condo has two possible liens: the mortgage and whatever the HOA is owed.
HOA dues attach to the unit, not to the person who owes them. If the seller is three months behind on a $340 monthly assessment, that $1,020 debt doesn't disappear when you take title. In most states it follows the property. You inherit it, along with any late fees and, in bad cases, a filed lien that has to be cleared before you can refinance or sell later.
Special assessments are worse. If the building needs a new roof and the HOA voted a $4,000 per-unit assessment last quarter, that obligation is tied to the unit too. Sellers in a hurry don't always volunteer this information, and it won't show up on a basic title search the way a mortgage does.
This is why the estoppel letter matters. It's a document from the HOA or its management company stating exactly what's owed on the unit as of a specific date: current dues, past due amounts, pending special assessments, and any violations. Most management companies charge $150 to $400 to produce one and take one to two weeks. Order it before you close, not after.
What People Get Wrong
The most common mistake is treating a condo subject-to deal like a house deal and skipping the HOA paperwork entirely, because the seller says "we're current" and the buyer takes their word for it. Sellers who are motivated enough to hand over a property subject-to are often motivated because money is tight. Being behind on HOA dues is common in exactly that situation.
The second mistake is not reading the CC&Rs, the covenants, conditions, and restrictions that govern the association. Some HOAs require board approval for any change in ownership, with a formal application and a waiting period of 30 to 60 days. Some have a right of first refusal, meaning the association gets the option to buy the unit before an outside buyer can. This has nothing to do with the lender's due-on-sale clause. It's a separate hurdle created by the association's own rules, and it can stall or kill a deal if you find out about it after you've already agreed to terms.
The third mistake is on insurance. The HOA's master policy covers the building structure and common areas. It does not cover the interior of the unit or the owner's liability. You need your own HO-6 policy, and the existing lender needs to be listed as mortgagee on it. If the seller cancels their policy the day you close and you don't have a new one in place, you've created a lapse that can trigger a notice from the servicer.
A Worked Example
Here's a deal that plays out the way most of these actually do.
The condo is worth $205,000. The seller's loan balance is $164,000 at 3.75%, with a monthly principal and interest payment of $980. HOA dues are $310 a month.
You pull the estoppel letter. It comes back clean: $0 past due, no pending special assessments, but the CC&Rs require board notification of any ownership transfer within 15 days and a $250 transfer fee.
Equity in the deal is $205,000 minus $164,000, or $41,000. The seller is relocating for a job and doesn't want to list, show the unit, or wait 60 days for a traditional sale. You offer $15,000 cash at closing to capture that equity position and cover the seller's move.
Your monthly cost going forward is $980 in mortgage payment plus $310 in HOA dues, for $1,290 total. Market rent on a comparable unit in the building is $1,650. That's $360 a month before insurance, vacancy, and repairs, on a property you got into for $15,000 plus closing costs and the $250 transfer fee, instead of a full down payment and new loan qualification.
If the estoppel letter had come back showing $2,800 in unpaid dues and a pending $6,000 roof assessment, the math changes fast. You'd either need the seller to pay it off before closing, negotiate a credit against your $15,000, or walk. That's the entire reason to pull the letter before you agree to a number, not after.
The Honest Limitation
The due-on-sale clause still applies. Nearly every mortgage, condo or not, gives the lender the right to call the full loan balance due if the property transfers without their approval. Subject-to deals happen every day and lenders rarely call the loan when payments are being made on time, but "rarely" isn't "never." That risk exists on a condo exactly like it does on a house, and no amount of HOA paperwork changes it. If you're not comfortable with that risk sitting in the background of the deal, subject-to isn't the right structure for you, condo or otherwise.
I've closed these both ways, deals where the estoppel letter came back clean and the HOA barely noticed the transfer, and deals where a $3,000 assessment nobody mentioned almost blew up the numbers three days before closing. The difference between those two outcomes is entirely in the paperwork you pull before you sign, not after.
If you want a system for running these numbers before you're standing in front of a seller trying to do math in your head, that's what Deal Machine is built for. It walks you through the same checklist I use on every subject-to offer, condo or house, so the HOA estoppel and the loan terms get checked before the deal, not after. You can grab it at readmoneydecoded.com/deal-machine.