Failure to include the necessary conditions may lead to the unenforceability of a lease or lease. It is essential that the landlord ensures that the basic terms of a rental agreement are included at all times. This is an important way to protect your rights as a homeowner from the beginning. The Massachusetts Fair Housing Act prohibits discrimination in housing on the basis of race, religion, national origin, age, ancestry, military or service origin, sex, sexual preference, marital status, disability, or the need for a guide dog, with the exception of homes of two self-inhabited families. Nor can a landlord refuse to rent you an apartment because you have a rental subsidy, because the apartment contains lead, or, with a few exceptions, because you have children.