In case the owner, agent, or other person or persons in control of the property along which such fence, barrier, or obstruction unlawfully exists cannot be found within 5 days after the issue of such notice, the Mayor of the District of Columbia shall publish such notice twice a week for 2 successive weeks in 1 daily newspaper of general circulation published in the District of Columbia. If within 5 days after the last publication of said notice the fence, barrier, or obstruction therein described be not removed, the Inspector of Buildings of said District shall immediately cause such fence, barrier, or obstruction to be removed, and the expense of such removal shall be paid out of the Assessment and Permit Fund; and the cost of such removal, together with the cost of said advertising, shall be assessed against said property and collected as general taxes in said District are assessed and collected; and the funds from which said payments are made shall be reimbursed from such collections.