I hope this answer can help you Holly, with in a co-op there is a managment company that takes care of the building etc etc. They require certain down payments, some require 5% but most that Ive come across require atleast 20% down. Your Best route would probably be a condo. Most condos go along the same financing lines as homes, and most of the programs availble for home buying are the same for condo buying. If you have any more questions or if you'd like to schedule some appointments to view some condos or co-ops please let me know, I have access to every availble property in Bay Ridge.
Thank You I hope this was a help
Fillmore Real Estate