well i live in the 60s on the west side and i agree that the lower areas are slightly better- 60s to low 80s. 89th and park ave south is probably gorgeous though.
i think hubba wubba explained the co-op thing perfectly- OOPS AND NISHI. basically you have rules of the building and if you don't follow them you can be brought before the board. you do not own your apt but shares in the bldg. it can be great since you're not responsible for repairs etc yourself as in a freehold house but on the other hand they have the right to reject future buyers of your apt etc (happened to me on my last apt and not fun- wasted about 6 months).
the most popular gym in the neighborhood is actually reebok. it's 67th and columbus. where jerry seinfeld works out etc. but there are plenty of good gyms closer to you like ny sports club and equinox i think.
spas- as someone says that depends on what you like. is bliss still popular?
i don't know who the hot designers are but i do know some designers and artitects and people who do kitchesna and baths etc. when it gets closer you can always email me.
omg across from the dakota? one of my friends lived in the building next door and i'm about 4 blocks from there. i have ALWAYS wanted to go in the dakota. i'm such a nyer. LOL
Thanks for the heads up. BTW, what is the maintenance of $4,600: rip-off or OK?