CoStar Group Inc. has renewed and expanded its lease at 33 Arch St. in Boston’s Financial District to occupy 25,200 square feet.

CoStar Group, which provides information, marketing and analytic services to commercial real estate professionals nationwide and in the United Kingdom, is expanding its Boston-based operations after its acquisition of Property and Portfolio Research Inc. (PPR), and Resolve Technology Inc. in 2009.

PPR is moving offices from 260 Franklin St. in Boston and Resolve Technology is relocating from 300 First Ave. in Needham.

PPR provides global real estate analysis, market forecasts and credit risk analytics to the commercial real estate industry. Resolve Technology provides real estate business intelligence and real estate portfolio management software that enables investment managers to optimize the performance and maximize investor returns in their commercial real estate portfolios. The offices of the two wholly owned CoStar subsidiaries will join CoStar’s Boston regional office in the building, occupying the top floor, the company said.

"Our new office in Boston will be one of the largest outside our corporate headquarters and we look forward to becoming an even bigger part of the business community here," said CoStar Group CEO Andrew C. Florance.

Lincoln Property Co.’s Senior Vice President John D. Miller and Assistant Vice President Jeffrey C. Moore represented CoStar in the transaction. Timothy Lyne and Lauren Phelan Lipscomb of CB Richard Ellis/New England represented the landlord.