Private equity firm the Riverside Co. has made its fourth add-on acquisition to Paradigm Tax Group with the purchase of Diversified Property Solutions.

Diversified Property, headquartered in Southfield, Mich., provides advisory services for real property, compliance, and personal property and tax incentives to customers, mostly in Michigan. The company analyzes property portfolios and looks for tax-savings opportunities.

The acquisition boosts Paradigm Tax's presence in the Michigan market and adds to capabilities and customers to the company.

Riverside, headquartered in Cleveland and New York, invests in businesses that are valued at up to $250  million. In February, the firm bought Pence & Associates, a Kansas City, Mo.-based tax group to add to Paradigm, following deals for AVS Tax Inc. and Hart Property Consultants in January. 

The company's co-CEOs, Stewart Kohl and Béla Szigethy, were named Mergers & Acquisitions M&A Mid-Market Dealmakers of the Year for 2013