Marcy is absolutely correct! Check the disclosure package for the name of the contractor, which should be noted on the permit. And, the City of Mountain View (as would any city) keeps records of improvements like this.
Of course, the simplest way to find out about anything is simply to ASK the seller for that information. Often, it's as easy as a phone call between agents to find out who completed the remodel, so long as the work was done during the time the seller owned the home.
Hope this helps!!