If you do not have a lease, but you do have your landlord's permission to live in your apartment, you are a tenant at will. This is the most common kind of tenancy. It is also called a "month to month tenancy" because landlords usually require tenants to pay rent once a month, in advance.
As a tenant at will, you have the right to "lawful and exclusive possession" of the place you rent. This means your landlord can only come into your apartment with your permission. If she does not get your permission, she is trespassing. 2 Many landlords think they can enter an apartment whenever they want because they own the property. Your landlord is allowed to enter your apartment only in certain situations. For more information, see Landlord's Right to Enter Your Home.
You are a tenant at will if:
3 . G.L. c. 183, §3. . "An estate or interest in land created without an instrument in writing signed by the grantor or by his attorney shall have the force and effect of an estate at will only. . . ."
4 . Murray v. Cherrington, 99 Mass. 229, 230-31 (1868); Berman v. Shaheen, 273 Mass. 343, 344 (1930); Marchesi v. Brabant, 338 Mass. 790, 790 (1959) (holding that a memorandum without date of commencement or termination of occupancy was not a lease.
5 . G.L. c. 186, §13. If the tenant has a written lease subsidized under state or federal law (for example, via a Section 8 voucher), a foreclosure does not affect the lease or the terms of the tenancy. G.L. c. 186, §13A; Federal Home Loan Mortgage Corp. v. Hobbs, Boston Housing Court, 95-SP-04475 (Winik, J., Dec. 18, 1995).