It is located on the Pacific coast in Northern California and employs some 4 or 5 dozen people in a small building in an otherwise nondescript research park.
It was infiltrated and attacked by AIM, who appear to have kidnapped Pym and stolen significant portions of his research data and materials. The Avengers discovered that his AI project, a child-like intelligent robot code-named Ultron lives there and can carry on intelligent if limited conversations. His secure lab is guarded by experimental Adaptoid security androids. (Assembly Required #2)