D.C. Mun. Regs. tit. 24, r. 24-307
A Sidewalk Cafe Permit shall automatically expire if the construction of the proposed cafe is not commenced within ninety (90) days from the date of the issuance of the Sidewalk Cafe Permit.
An applicant may request that the Director of Consumer and Regulatory Affairs and the Director approve a delay in the construction of the sidewalk cafe. The request shall be in writing and shall provide sufficient reasons for the delay.
Upon recommendation of the Director, the Director of Consumer and Regulatory Affairs may approve any justifiable delay in the progress of the construction of a sidewalk cafe. The delay shall not exceed three (3) months.
If the construction is commenced within the prescribed period, but is not completed within six (6) months from the date the Sidewalk Cafe Permit was issued, the Director may recommend to the Director of Consumer and Regulatory Affairs that the Building Permit be revoked due to a lack of construction activities.
D.C. Mun. Regs. tit. 24, r. 24-307