A top executive who helped build Dan Gilbert's real estate empire is leaving the company.

Dan Mullen's last day with Detroit-based Bedrock LLC is June 7, the company said in a Friday afternoon email to Crain's.

Mullen is leaving "to pursue other interests," Jim Ketai, Bedrock's chairman, said in a prepared statement.

"This change is a huge one for me personally and I have been working with Bedrock over the last several months to make sure this was a smooth transition for all involved," Mullen, 38, said in a statement. "I'm excited about my new endeavor and cannot wait to share more details soon."

No other details about Mullen's plans were revealed.

Ketai said in his statement that Mullen was integral as Bedrock began building its real estate empire and helped on the company's acquisition of the Madison Theatre Building downtown, its first building purchase that triggered dozens more as Gilbert's Quicken Loans Inc. and real estate appetite grew.

The portfolio has since grown to include skyscrapers, parking decks, midrise buildings, vacant land for development and sprawling mixed-use projects under construction or in the planning phases.

"Since then, he has been a key member of the leadership team that helped grow our portfolio to more than 100 properties in Detroit and brought local and national businesses downtown," Ketai's statement continued. "We wish him all the best in his future endeavors and we thank him for his contributions to Bedrock's growth."

He was part of a C-suite of musical chairs in the fall that ended up with him in the role of executive vice president of business development, a role he took after being Bedrock president. The move took him to more of a business recruitment role, Crain's reported at the time.

Mullen has been working for Gilbert since the age of 22, when he started as a mortgage banker with Quicken Loans. Within a decade, he was in Bedrock's top echelons.