We finally sold our NYC apartment. For anyone contemplating buying and then selling in NYC, the selling process took about 8 months with a cash buyer with sterling credentials -- about 6 months to get a contract (with two price drops) and then 2 more months to get board approval and schedule the closing. Closing costs were about 10%, and we sold for $50k less than we paid.
We deposited the checks, set up an investment account at Vanguard with most of the money, and set aside the rest in a savings account to pay the taxes. Cancelled ConEd, insurance, and bill pay for the monthly maintenance, so that's ~ $1,000 a month we won't be paying now.
I also filed all our tax returns and paid estimated taxes for the first quarter and set up autopay for the other three payments.
We were quite sad to leave the place behind, but it's also liberating. It was a stupid decision to buy it in the first place, but live and learn. At least we didn't lose too much money on it. I just hope the market for that type of apartment doesn't suddenly get hot now! But I'm going to try not to look back.