Of course the CIA had a secret outpost
Once you have a line on a target, you need human intelligence to get up close to monitor the situation. Accomplishing that in a sensitive nation such as Pakistan would be extremely difficult. Keeping the team small and unobtrusive would be an enormous challenge.
One NowPublic story from a conspiracy theorist had it that the CIA actually built the bin Laden hideout. That is absolutely false. But, with little tidbits of information and imagination, creative people can go wild.
“Breaking News Alert: CIA had secret outpost in Abbottabad
May 5, 2011 8:46:35 PM
The CIA maintained a safe house in the Pakistani city of Abbottabad for a small team of spies who conducted extensive surveillance over a period of months on the compound where Osama Bin Laden was killed by U.S. special operations forces this week, U.S. officials said.
The secret CIA facility was used as a base of operations for one of the most delicate human intelligence gathering mission in recent CIA history, one that relied on Pakistani informants and other sources to help assemble a "pattern of life" portrait of the occupants and daily activities at the fortified compound where bin Laden was found, the officials said.