D.C. Code § 42-3203
A tenancy at will may be terminated by 30 days notice in writing by either landlord or tenant.
Mar. 3, 1901, 31 Stat. 1382, ch. 854, § 1220
1973 Ed., § 45-903.
1981 Ed., § 45-1403.
Alterations to units after notice to vacate, prohibition, see § 6-731.01 et seq.