I am unsure why you are talking about Mortgage, but if you own the property you want to sub-lease, then you should find a professional that can make the researches for you to find out more about the rules in the Building.
You can contact the Elite Group at Nest Seekers to help you further with that.
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(o): 212.252.8772 (EXT.782)
" It is common in all businesses that the level of customer service, is usually based on income generated from that service given; which is fairly unfair to those who need just the same service of selling, buying or renting in New York City.
That's one of the reasons why we came up with ELITE. It is the highest standard level of same service given from a $2000 rental to a $40 Millions sale, and instead of treating the customers differently, we've decided to give them the ELITE service.
Let's help you with our services, no matter your budget, what you are selling or want to buy, we will give you and your referrals the same best experience ever lived. "