San Francisco -- Benchmark Capital, the Menlo Park-based venture capital firm, will open a new office in San Francisco's Tenderloin district, closer to the headquarters of many of its portfolio companies, including Twitter. "Our move to the city speaks to this change in the entrepreneurial landscape," wrote Peter Fenton, a general partner at Benchmark, in AOL technology blog TechCrunch. "Two out of every three new investments we have made since 2009 have been in San Francisco. Our partners currently sit on more than 20 boards in San Francisco including Twitter, Yelp, Instagram, Uber, NewRelic, Zendesk, Dotcloud, Asana, OpenTable, DemandForce, NextDoor, ServiceSource, Lithium, Marin Software, 1Life, Second Life, Coverity, EngineYard, Couchsurfing, Grockit and Pipewise." Twitter next month plans to move its headquarters about a half mile away from the new office, which will be on the top floor of the Warfield Theater.