Thanks for the shout-out Milton - HDFCs are in fact sellable on the open market, and though UHAB, a nonprofit that specializes in HDFCs, doesn't advocate using brokers (you know...we're talking affordable housing, here) they can help in moving those sales along. Just please be sure you and your broker know completely and fully what the limitations are, and try to have an open honest dialogue with your broker about how they're selling it. When I was a buyer, I saw too many apartments that were HDFCs, but nobody mentioned the restrictions for fear of losing the sale. I would've been more interested if I knew there was an HDFC support network, but all I saw were buildings that seemed at face to be inaccessible (because I wasn't able to talk to the board or sellers) and the potential for a financially unstable purchase.
DO - have all the restrictions, board background, maintenance costs, and possible financials that may affect maintenance on hand for the broker to share. Otherwise it will be just tons of wasted time.
DON'T try to shut buyers out by being vague about the details of the HDFC's board, or resale/buyer caps.
DO - Pitch what a great deal it is to live in a permanently affordable situation in NYC.
DON'T keep your board in the dark about your intentions - if the board can help back you in the sale (the inevitable benefit being the flip tax they get) it will seem more appealing for the buyer who is readying to enter a community-feeling environment.
A good idea that some HDFCs do is sell the shares back to the building. The seller gets whatever the building would've capped the profit at, and nobody wastes fees on banks and brokers, and then the building can re-sell the unit and get some much-needed capital at a whole price into the building. (Plus it puts the marketing on them.)
Also, consider going to neighbors or board members to see if relatives may want to buy. It could be the fastest process for selling.
Lastly, you are highly encouraged to post a free listing with UHAB at our website, http://www.uhab.coop