How though it's hidden from mortals eyes lol it just looks like an abandoned warehouse to everybody else and they don't know about the Greek pantheon only Carter and Sadie do same with Percy and annabeth and the gods well and now my character
"The mansion is five stories high and is magically hidden on top of an abandoned warehouse. It is built from enormous limestone blocks and steel-framed windows with hieroglyphs around them. The entrance is a block of wood with no handles or knobs and can only be opened by magic. A terrace wraps around the house and contains a swimming pool in which Philip lives. It cannot be seen by regular mortals and magical barriers keep pests, gods, and monsters out."