You already received an answer about the maintenance. Regarding your other question if foreigners can purchase in this building - it is easy to find out, once you engage an agent, your agent can make inquiries with the management company and check if pied a terres (buyers who will use the place as a 2d home and not as a primary residence). All condo buildings allow foreign buyers and many of the coops do but each coop building has its own policy about it. Also, to give you a more detailed answer, one would need to know how you intend to use the apartment after you purchase it, i.e. if you intend to rent it out or use for yourself as a pied a terre or as a primary residence. The intended use and some other factors will determine what particular property will better suite your needs.
I would be happy to give you necessary clarifications and assist you throughout the process.
646 593 7207