D.C. Mun. Regs. tit. 11-D, § 901
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901.1
Buildings constructed on or before April 17, 1992, and existing legitimate uses within the buildings shall be deemed conforming, except that no addition, replacement, or expansion of the building, or change in use (except to a more con
forming residential use other than a dormitory) shall be permitted unless in conformance with the requirements of the R-3/FB zone.
901.2 If any building is destroyed by fire, collapse, explosion, or act of God, it may be reconstructed or restored to its previous condition or to a more conforming residential condition other than a dormitory. Excluded from this provision are uses that:
(a) Were nonconforming prior to April 17, 1992; and
(b) Not authorized by relief granted by the Board of Zoning Adjustment.
SOURCE: Final Rulemaking published at 63 DCR 2447, 2834 (March 4, 2016 – Part 2); as amended by Final Rulemaking published at 70 DCR 011297 (August 25, 2023).