The best way for me to answer this question is by my own personal experience. While most Real Estate Agents are able to work from home because of the computer age we live in, I do the vast majority of work from my apartment. This never presents a problem for anyone because it doesn't cause any intrusion on anyone else who lives in the building. However I have worked with apartment buyers who had this similar question as you do, and I advised them in the following way..., if you plan to buy a condominium with the goal of having a home office, this will not present a problem. If you plan to run a small business with several employees, then you will more than likely run into a challenge, especially considering that there are building rules that you will most likely be breaking, let alone city zoning laws. It would be considerably more challenging to run a small home business in a co-op building, as they tend to have many more rules for their residents to abide by, but a home office would go under the radar.
A funny story having to do with this same question: I am friends with someone who works from his upper east side apartment, and makes his living by producing music. He has a recording studio in his apartment, with no sound-proofing. The reason he has never run into a problem is because he only plays the music loud during the day, when he knows most of the neighbors are at work.
Senior Real Estate Sales Associate