Commercial activity is returning to the office space formerly occupied by Oscar Mayer in Madison. Reich Brothers Holding is developing the property it bought last year from the previous owner, Kraft Heinz. Up to four-thousand people had worked for Oscar Mayer at the location since 1919. Production was ended there last June. Total Administrative Services moved into part of the office building last Friday. T-A-S-C is headquartered in Madison. Reich Brothers says commercial space is still available for rent there.