Property Management legal question

[Robin Behrstock]

I own a duplex in Milwaukee Wisconsin and Renters Warehouse is the property manager. I noticed they use the same company (Brew City Property Services) for all repairs and from my own property management experience, the charges seem high and BCPS appears to be an unnecessary middle man who is hiring cleaners, electricians etc, when Renters Warehouse could be doing that. I searched the wisconsin business records and saw the same person owns Brew City Property Services and Renters Warehouse, a man named THOMAS M. DIDIER. Is what they are doing here legal?