If Lulu is going to stay at Capsule Corp by the good graces of the Briefs' then I don't see how this would be an issue. Maiyah's planning on breaking in at night and not being seen or heard is going to be her biggest priority.
Pertaining to the layout of Capsule Corporation I have done what research I could and my findings are such as follows:
Description in Daizenshuu 4: Capsule Corporation, which Bulma's father Doctor Brief spent his entire life building. Through his brilliant inventions, he came to possess the biggest mansion in West City. On the first floor are the main lobby and the doctor's research room, as well as the reception room and such, while in the building's center is an indoor garden. Here various species of animals, from dinosaurs to dogs to cats, run free. Bulma's room is on the fifth floor, and it is set up for her to be able to repair and develop vehicles. After Vegeta came to live here, a gravity room was built into the uppermost floor. There was enough space for Oolong, Puar, and Yamcha to live here after the very first search for the dragonballs, as well as for the Namekians and Vegeta to lodge here. By the way, this was always Doctor Brief's home laboratory; Capsule Corporation's main office is located in another part of West City.