Rogaris Law Office, which focuses on residential real estate and estate planning law, has leased 3,284 square feet on the fourth floor of Phase 1 of Watch Factory Offices in Waltham.

The law office is moving its offices from 411 Waverly Oaks Road in Waltham.

"Our office is thrilled to be moving to the Waltham Watch Factory. The building has a unique combination of old world charm and the luxury of modern amenities. With interior brick walls and wood beam ceilings, the office spaces are exceptional," said John Rogaris, owner of Rogaris Law Office.

Boston-based Berkeley Investments Inc. is transforming the 400,000-square-foot complex into a mix of offices, loft-style apartments and retail uses with riverfront amenities. Phase 1 consists of 160,000 square feet of newly renovated brick-and-beam office space, which is now 28 percent leased, according to a statement.

Berkeley Investments was represented by Eric Ekman, project manager and Steven Brooks, vice president of asset management, and Jack Kerrigan Jr., Dan Krysiak, and Patrick Carey of Grubb & Ellis. Rogaris Law Office was represented by Tim Brodigan of Klemmer Assoc. LLC.