Dan Gilbert's Bedrock LLC is anticipated to begin demolition in June on a pair of buildings downtown that will make way for a large underground parking garage for his planned $830 million Monroe Blocks development.

Documents filed last week week with the Michigan Department of Environmental Quality say the buildings at 1000 Farmer St. and 815 Bates St. will be torn down using an excavator following removal of asbestos; the abatement is expected to begin in a few weeks.

Carleton-based Homrich Inc. is the abatement and demolition contractor, according to the documents, known as "notification of intent to renovate/demolish."

Gabrielle Poshadlo, senior communications director for Bedrock, said demolition on the buildings is expected to begin in June.

The existing two buildings total about 43,000 square feet, according to the DEQ documents. Bedrock's transformational brownfield plan submitted to the state for tax incentives says the project is expected to include three levels of underground parking with approximately 1,200 parking spaces across the 3.66-acre site and below Cadillac Square.

The two-block site east of the former Compuware Corp. headquarters building (now called One Campus Martius) is expected to be redeveloped with a 26-story residential tower; three mid-rise apartment buildings between six and 15 stories totaling 482 units; and a 35-story office tower with at least 818,000 square feet of space. Construction on the parking component is expected to begin this year, while the buildings are expected to be constructed starting next year, according to the brownfield plan.

It is one of several large-scale developments Gilbert, the founder and chairman of Quicken Loans Inc. and Rock Ventures LLC, has in the works. Others include the $909 million redevelopment of former J.L. Hudson's department store site on Woodward Avenue at East Grand River Avenue, where construction is underway on what's expected to be Michigan's tallest building, an 800-foot residential skyscraper.

In addition, he has been working on historic redevelopments like the $313 million Book Tower and Book Building project on Washington Boulevard and plans a $90 million addition to his One Campus Martius headquarters.

An entity tied to Gilbert, 1000 Farmer Street LLC, paid $1.4 million for the two buildings in October 2012, according to city land records.