Developers redoing a downtown Dallas skyscraper have completed what they say is the largest environmental abatement and demolition project ever in Texas.

The $240 million redevelopment of the 52-story former First National Bank tower is the largest such project ever in downtown Dallas.

Drever Capital Management bought the marble and glass high-rise on Elm Street out of bankruptcy last year and is converting it into a mixed-use project.

But first they had to remove asbestos-containing materials from all of the 54-year-old high-rise's columns, beams, and floor and ceiling decks.

Drever says 32,000 cubic yards of material were removed from the building to make way for the reconstruction.

"In the next 30 days, crews will be working to put up drywall, install electrical, begin stair fabrication and new elevator fronts, pour concrete and more," the company said in a statement Friday.

The landmark tower is scheduled to reopen next year as The Drever with a 218-room Thompson Hotel; 324 apartment units; a high-end spa and wellness center; more than 40,000 square feet of office space; and 24,000 square feet of retail.

Dallas-based architecture firm Merriman Anderson/Architects Inc. designed the renovation and Andres Construction is the general contractor.

The 1.5 million-square-foot downtown tower has been empty for almost seven years.

Subscribe to our new weekly real estate newsletter.