WASHINGTON, DC-StonebridgeCarras and Walton Street Capital are prepping for phase two of Constitution Square in NoMa, readying design plans and lining up financing for a 203-unit multifamily building and an office property--a spec office building, to be precise, StonebridgeCarras principal Doug Firstenberg tells GlobeSt.com.

To be called Three Constitution Square, the office component will add another 345,000 square feet of office space into the almost fully occupied NoMa submarket when the building delivers in Q4 2012. The apartment building will be completed in that time frame as well. “We have had so much success with our first two buildings here that we are getting requests about the next phase,” he says.

StonebridgeCarras and Walton Street Capital sold the 589,000-square-foot Two Constitution Square to Northwestern Mutual this summer. Located at 145 N St., NE, it sold fully preleased to the Department of Justice for 15 years. Two Constitution Square is part of the 1.6-million-square-foot Constitution Square project. Its first phase consists of

One Constitution Square, a 329,251-square-foot office building that is preleased to the GSA to serve temporarily as its headquarters during renovations; a residential building with 440 luxury apartments; a 50,000-square-foot Harris Teeter grocery store; a 204-room Hilton Garden Inn with upscale meeting facilities; and a 30,000 square feet of street-level retail space.

Now, the developers are beginning phase two, with construction costs that Firstenberg estimates to be around $200 million, with $135 million allocated to the office building and $65 million to the residential component. He says that the company is close to finalizing financing for the residential component from a private bank group. Firstenberg is just starting to seek out the office financing, but given the demand for space in NoMa, he is not worried. “If need be, we will kick in our own financing,” he says. “We already have in fact.”

While NoMa has become a defacto submarket to house government operations, it has moved more slowly to realizing its other goal of becoming a work-live-play center. Still, there too, Firstenberg sees progress. The residential community in phase one is leasing well, he says. “The building officially opened on October 1 and we have close to 60 units leased already. Effective rents have been very strong and we are confident that the market will support another residential building.”