You should consult an attorney about this matter. The facts you detail in your post require discussion and analysis which should be confidential.
Speak with an experienced landlord tenant lawyer off line confidentially. Your fact pattern is not favorable to you.
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From what you recount, under the Section §2520.6(u) of the RENT STABILIZATION CODE, you would not be able to claim the apartment as your primary residence. Consult a local real estate attorney.
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A rent stabilized tenant with a legal sublease does not live in the apartment at all during the term of the sublease, but returns to full time residency when the subtenant moves out at the end of the sublease. A rent stabilized tenant is allowed by law to have a legal sublease for as long as two years duration in any given period of four years of time.
As a matter of law, the apartment remains your primary residence for the duration of the sublease. You are expected to leave behind your apartment furnishings, if you sublease the apartment as furnished.You are entitled to a 10% surcharge above your lease rent when subleasing a furnished apartment.
Any consideration to the idea of subleasing, should be with an attorney guiding you and preparing the sublease and other documents.
It sounds as though you and your girlfriend are both custodial parents and your parental rights should guide all your other decisions.
The answer provided to you is in the nature of general information. The general proposition being that you should try to avoid a bad outcome if you can.