The Avengers Tower was built between 2009-2013. It is one of the business places for Stark industries and a base for the Avengers team. Tim's Office is where Timothy Stark, CFO of Stark Industries and Leader to the Avengers, can be found. He should not be disturbed by any Avengers member during office hours unless it is an extreme emergency. If you need help navigating around the mansion, remember that JARVIS is always around.