Jimmy Valentine's brother has correctly answered your question: it is Rumsfeld's own house.
I must add that the DC Chapter has a policy against demonstrating a person outside a person's house, as the leftists are doing here. Two exceptions to the policy:
(1)Official residences (e.g., White House and Vice President's Official residence) and
(2)protesting a fundraiser at the site of the fundraiser, even if it is a personal residence (e.g., DC Chapter protests outside Hillary's mansion during a fundraiser at the mansion). This makes sense because neighbors have got the fundraiser guests in the neighborhood anyway.
Thanks guys for replying. I did not have any problem at all over you guys counter protesting these crazy leftists in front of Rummy's house. I was just very curious over whether the government provided official residence to cabinet secretaries; I was curious because I wondered how did the leftist know it was Rummy's house then? For that matter, how did you guys find out it was Rummy's house?