Most of the post war buildings on upper Broadway in the west 80's and west 90's were built in the late 1980's. The Broadway, The Bromley, The Boulevard, The Savanah, The New West.
Between 72nd Street and 96th Street buildings have a height limit of about 20 storeys. Above 96th Street and below 72nd Street the buildings are much taller.... more
In a market that is gaining, fringes are fine...in a market tthat is stagnant or in decline you want to be careful, if you plan to live there quite a while you should be OK.
I began in the depths of the market in 1991, I saw a number of buildings that had just been built or redeveloped on the fringes...they were like islands in the desert. You coul end up in a coop or condo that gets in serious financial trouble if owners cannot sell or rent and have to dump their units or be foreclosed upon. Even if the Coop/condo can ultimately get the money from a sale they may have to cover nonpaying owners in the interim. You can see assessments to cover ongoing expenses. (Bank gets its money first remember--and they only care about getting theirs as fast as possible)
BTW I lived on Ave A and East 10th back in 1991, Great Townhouse on the Park...a very "Rent Musical" time, yes I even frequented the Life Cafe! When it was not scary it was fun, but it was more scary than fun. I would be wary of Ave C & D. But I am older now!... more