Doing the last part of the Black Mountain mission... going up to the second floor of the radio station, says i need a key. I looked in all the surrounding buildings and couldnt find it. I've been at it for over an hour. Help please?

Ya that part of the "crazy, crazy, crazy" mission is giving me hell as well.. where is the darn key..

Read the computer entries in the first floor room. Tabitha records where she keeps her spare key...

Its under the stairs leading up to her room.