Dan Gilbert adds historic skyscraper, Broadway building to downtown Detroit portfolio

Separate deals include 652-space parking garage

"Significant" investment expected at all three properties

Detroit real estate and mortgage maven Dan Gilbert has purchased three more downtown properties: The Buhl Building on Griswold Street and its parking deck, plus the Harvard Square Centre building on Broadway Street for an undisclosed price.

They add to Gilbert's ever-growing portfolio in the city's center core, representing 441,000 square feet and 652 parking spaces.

His Detroit-based Bedrock LLC's real estate ownership, management and development company's empire is nearly 100 properties (buildings, parking decks and surface parking lots) totaling nearly 16 million square feet in greater downtown Detroit. Bedrock also has billions of dollars in ground-up construction planned around the central business district.

The purchase price and total capital expenditure expected on the three properties were not disclosed, but Bedrock co-founder and CEO Jim Ketai said "significant" investment will come to the three buildings in the near future.

Here's what to expect under Bedrock ownership: