42Floors, the YC-incubated startup that has built a search engine for the office rentals market, has raised another $12.3 million -- funding that founder Jason Freedman says the company will use to take its service to markets outside of San Francisco and New York, including its first international move to London by the end of this year. The Series B round was led by new investor NEA, with participation from existing backers Bessemer Venture Partners and Thrive Capital, as well as new investor Columbus Nova Technology Partners.