Maryland Code, Housing and Community Development § 7-306

(1) may not terminate or alter the terms and conditions of a lease entered into before the effective date of the protected action;

(2) may not interfere with the efforts of individual tenants to obtain housing subsidies or other public assistance;

(3) may not discriminate based on source of income or receipt of a housing subsidy;

(4) may not interfere with the rights of a tenant to occupy an assisted unit under an existing lease or applicable federal, State, or local law; and

(5) shall cooperate with a tenant to execute all necessary documents to enable the payment of housing subsidies to or for the tenant.