HFF, a firm that provides commercial real estate and capital markets services, said that it has arranged $20 million in financing for Newton Wellesley Executive Office Park, a four-building suburban office park in Wellesley.

HFF said it worked exclusively on behalf of Newton Wellesley Executive Office Park LLC, an affiliate of the Nelson Cos., to secure the 10-year, fixed-rate loan through Principal Global Investors. The Nelson Cos. buys, develops, and redevelops office buildings, retail centers, hotels, industrial properties, and multi-family residential buildings.

With about 130,000 square feet of space, Newton Wellesley Executive Office Park is 100 percent leased to 25 tenants in the high technology, legal, financial, professional and personnel service industries, HFF said.