Residential property tax relief — No homestead when multiple homesteads claimed

D.C. Code § 47-850.04 — under Authority and Procedure to Establish Real Property Tax Rates..

D.C. Code § 47-850.04

If an individual, shareholder or member claims more than one homestead in the same tax year, and has not timely notified the Mayor of all changes in eligibility, the Mayor shall disallow the deduction for all homesteads claimed by the individual, shareholder, or member.