Trammell Crow Co. said Monday that its stockholders have voted to approve the merger agreement with CB Richard Ellis Group Inc.

Trammell said it expects to complete the merger, which will pay Trammell shareholders $49.51 per share, by Dec. 20. The merger was announced on Oct. 31.

Shares in Dallas-based Trammell were up 90 cents to $49.47. Shares in El Segundo-based Richard Ellis Group were up 5 cents to $32.99.