Urban Igloo president Rick Gersten (second from right, flanked by DC staff Bryan Zupan, Debbie Kaplan, Kate Becker and Matt Leighton) tells us that the online apartment rental company has opened up a third office in its fast-growing network. It's in one of DCs most sought-after rental markets, Capitol Hill, at 426 C St NE.So if you are keeping score at home, that makes two offices in DC and one in Philadelphia. Rick tells us that Capitol Hill remains a strong rental market due to its highly transient population. True that: The Washington Post reports that 45% of Capitol Hill homes are renter occupied. At all three locations, Urban Igloos licensed leasing agents meet one-on-one with apartment hunters to provide advice and deliver tours of target neighborhoods and individual properties that match needs and budgets. Online, more than 5,000 renters each month search for apartments on Urban Igloos website. Think of it as a Match.com forrenters and landlords. Check out our sponsor here.