Hi,
It mainly depends on the building you are looking to buy into.
However, I have handled plenty of Co-ops and on average it is anywhere from 10% - 25% and have to have an income ratio of 3:1. Meaning whatever the maintenance is your monthly income needs to be 3 times that amount. Also you will need to show 3 months of pay stubs and bank accounts.
If you need more information I would be more than happy to help you out.
Feel free to either call me or email me.
Cell# 201-754-8895.
Email ADolah@gmail.com
Thank you,
Ash