I said taxes. And it was not a condo, but a co-op. All of my apt were co-ops.
A co-op is a uniquely NY thing, essentially it is a real estate corporation that owns the building. You buy shares in that corporation, entitling you to occupy your apartment. Its helpful to think of the shares are the same thing as a deed. The shares are pledged for the mortgage. The interest on the shares is deductible, same as on a mortgage.
The property taxes. You don't pay prop taxes on your apt, but the corporation pays them on the whole building. You pay maintenance to the corporation every month. All of the buildings I have owned a co-op, the maintenance also included heat, hot water and electricity. So, you pay $500 per month, for example, and 60% of that is tax deductible (the prop tax portion of the maintenance).
There are no separate co-op fees, it is included in the monthly maintenance.