Dan Gilbert's Rocket Companies plans to buy the online real estate brokerage firm Redfin, a $1.75 billion deal that would expand Rocket's presence in all things residential real estate. The all-stock deal was announced Monday morning and, pending approval by Redfin shareholders, is expected to close in the second or third quarter.

Dan Gilbert's Rocket says it wants to build an all-in-one home buying experience with the purchase, "from search to close."

Mortgage lender Rocket Cos. has agreed to acquire online real estate brokerage Redfin in an all-stock deal valued at $1.75 billion.