Around the VA/MD/DC region, the District probably has the most rigid tenant law here. According to RealtyTimes, on August 5, another amendment become law. The gist:
If you are a landlord -- which the law calls a "housing provider" -- you will no doubt be concerned about the major changes in the law. If you are a tenant, however, you will probably be delighted with the scope and effect of Act 16-391.
Exemptions include rental units built after 1975, and federally or District subsidized rental units. Perhaps the most important exclusion is for individuals who own four or less rental units in the District of Columbia.
It should be noted that corporations, including limited liability companies, are not "natural persons" and thus even if a corporation only owns one residential unit, it is not exempt from the coverage of the Act.
It should also be noted that these exemptions are not automatic. The landlord must file an exemption form with the Department of Consumer and Regulatory Affairs (DCRA) and must also obtain a business license authorizing the rental of the unit or units.
If you are a tenant, you may get some breaks. For example, senior citizens and disabled tenants regardless of income can't have their rent increases by 5 percent per year. The whole rent control thing is so complex, to learn more about it, read here.