If I understand your question correctly, you are basically asking how much the common charges and taxes would be on a 2 bedroom, 1 bath co-op.
For co-op's in this area, you would be looking at about $900 - $1,200 per month which includes your common charges, taxes, and in some cases your heat and hot water as well.
Co-op ownership is a bit different than owning a condo.
For specific questions, feel free to contact me directly.
Milligan Realty, Norwalk