Private equity firm the Riverside Co. has completed two add-on acquisitions for Paradigm Tax Group.

Both AVS Tax Inc., a Phoenix-based provider of property tax management services, and Hart Property Consultants, a St. Cloud, Minn.-based real estate tax appeal services provider, will be added to Paradigm. Terms of the deals were not disclosed. 

Riverside bought Phoenix-based Paradigm in November 2013. The company provides property-tax consulting services for commercial property owners.

Riverside, which was named Mergers & Acquisitions private equity firm of the year for 2012, closed its largest fund with $1.5 billion in commitments in January. The company bought Paradigm out of that fund, as well as Rutland Plastics, which Riverside picked up in September.