Hello and thank you for the opportunity to assist you. My name is ***** ***** I will do my very best to answer your legal questions.
It's lawful for the landlord to change the terms of the lease once the lease expires. In other words, there is no legal obligation to keep the terms of the lease the same as in the past once the lease expires. Of course, this means that you also have the option to refuse, make a counteroffer, etc. You could theoretically tell the landlord that you will not only not pay $3800, but you won't even pay $3500 anymore, and that the most you will pay after August 15th is $3000. Of course, if you and the landlord cannot agree on rent (and other terms), then you will need to move, and the landlord will need to find a new tenant who will accept her seemingly unreasonable terms.
As for the lack of a permit, that may only apply to buildings with multiple dwellings, and not a single family house for one family. However, if you tell me exactly the town in Long Island, I may be able to find more. Information on that if you'd like.
Does that answer your question(s)? Please let me know if you need clarification, as I am happy to continue helping you until you are satisfied. Also, please remember to provide a positive rating via the stars (and note that your positive rating is the only way that I'll get credit for helping you, so it is much appreciated!). Thank you. :)