I think you are correct there is not much of a chance that a condo will allow day care. I sell 70 % condos and most of the rules say you can not run a business from the home.
I do think i would start looking for the new rental as the bank will only give you the same notice a landlord has to give. 30 days notice. If you give me a call I can try to find a buyer to buy it and rent back to you.
maybe then the bank would let you stay.