How does one get 220v line for an oven into an apartment in NYC. I am trying to renovate a kitchen and all the good ovens are 220v, I only have 110 in kitchen, I am on the fifth floor. Does this mean wiring from basement to apartment has to be changed, or can there be some combining of 110v lines?

The apartment owner or management company will have to get a building permit, a licensed electrician will have to be hired ( or a licensd one that works for the landlord) Since this will be a line for one specific outlet, it would seem a new line ( you did not say what amp 220) Also there will have to be room in the breaker box for a new 220 line>

By the way, it is more like 120 and 240 volts. Most 120 volt circuits are 15 or 20 amp. A typical oven takes 40 amps at 240 volts. Code is likely to require running new 8-3 with ground for an oven.

For the two above responses I thank you greatly, that is a tremendous help for my situation, I can now at least speak intelligently to the management company.

All good answers, but playing devil's advocate, since this is an apartment that you rent, are you even allowed to do any renovating? Obviously, I have no idea as to the extent of your "renovation" (maybe just the oven), but since this is a multi-family building renters are generally prohibited from doing major work. FR is correct in contacting the owner/management company, but I would be sure to inform them if your plans involve more than just the oven. Additionally, since you rent, you'll most likely have to foot the bill for the electrical work if they allow it.