The woman I subletted to without my consent or knowledge decided to sublet my sublet to people for a profit. A tenant can sublet without the landlord's permission, even if the lease says its forbidden.A tenant must inform the landlord of the name of any occupant within. This booklet explains many of these laws you need to know and provides resources where you can find more information about landlord and tenant issues. Securing written consent from the landlord is a crucial step. Without it, the sublease might not be valid. After it is signed, a written lease may not be changed without consent of both parties. Rent regulated apartments are rent stabilized or rent controlled. Most leases prohibit subletting, or only allow it with permission.