Miami Valley Regional Planning Commission is moving offices in downtown Dayton. The group announced Monday it has plans to relocate its 25 employees from current spaces in Fifth Third Center to the Courthouse Plaza building across the street, with a new address at 10 N. Ludlow St. suite 700. The move will happen in mid-October, it said. "Since our current lease expires this year, we took the opportunity to see what else was available that suited our needs better," said Brian Martin, MVRPC's…