Demolition began Monday night on the former Maas Brothers store in downtown Tampa. Closed in 1991, the 1886 building is so dilapidated not even fire marshals or structural engineers dared enter. The four buildings on the site will be gone by the end of March to make room for 500 condo units with 14,000 square feet of retail and commercial space. If the City Council approves the plan, Wood Partners of Atlanta will break ground later this year.