Keep in mind, you have not signed a contract yet, so anything can be worked out.
This could have been avoided if you had been pre-approved for your mortgage. It sounds as if you did not do that. Pre-approval for your mortgage would have provided you with a good faith estimate of all costs.
A seller concession is still possible. You should also understand that the amount of the seller concession is added to the best price you can get and credited back to you at closing. This allows you to amortize the closing costs with a modest increase in your monthly payment. You should be able to accomplish your goal if you really want the condo and qualify for the mortgage. But don't be afraid to ask questions of you attorney, your agent and your lender...........Good luck, I'm sure you'll do well.
Century21 Yve Real Estate
Licensed Real Estate Agent
NYS Certified Residential Appraiser