Bank holding escrow for grandfathered-in "garage"

[Wenxiang Gu]

Hi fellow RE investors, 

Bought my first 3 family investment home in Brooklyn, NY. There is a grandfathered-in rear building on the property. The bank is holding an escrow and needs me to turn it into a "garage". 

It's never been a garage before because a car simply won't fit the driveway to get to the back. I have already cut the gas line, taken down the kitchen, and closed all pipes in the bathroom. (The seller's older parents used to live in it) And the bank is still not satisfied. 

Is there any creative way I can do to make it look like a "garage"? I am not trying to make it into a legal apartment or anything and no intention of renting it out. It will be my own office/storage. 

The DOB website states that there are two buildings on the Lot: the 3 family house and the "rear building". Somehow this bank is saying it needs to be a garage. When the previous owners had no problem getting a mortgage when purchasing and also refinancing. 

BTW the bank is Hanover Bank. Super regret using them. Took me 6 months from putting in an offer to closing. 

Any help would be appreciated. 

Thank you

Ted