Building restoration is the work that happens after the mold itself has been treated: drying out and repairing whatever the water reached on its way through the house, so a room goes back into use instead of sitting stripped down to bare studs. In practice the two jobs run together, because whatever caused the mold in the first place, a corroded pipe fitting or a roof that let winter rain through, is usually still touching the same drywall and framing that need to be dried out and put back.
In Anaheim, what that looks like depends on which part of town you're in. Downtown in the Colony, mold often turns up in the crawl space under original hardwood floors, fed by plumbing nobody has touched in decades. Out in Anaheim Hills, the two-story homes built from the 1970s through the '90s show it differently: an upstairs bathroom leak can run for months before anyone notices, and the first sign is a soft brown ring on the ceiling below it. Either way, by the time you can see it, the moisture has usually been sitting in the framing or subfloor for a while.