You could have broken pipes under the basement slab or a host of other issues.

@Al Williamson hosts local BP meetups in Sacramento, I believe the next one is set for May, set your keywords to "Sacramento MeetUP" and you'll catch the announcement.

Incidentally for the Drexel Alum still in the area Drexel is hosting a Real Estate 101 course on Thursday.

I host the Black Diamond that Brian mentioned, url is in my signature. 

BP is hosting a webinar tomorrow evening on this very topic.

Host a South Bay Meetup.  

I got a chance to spend a lot of time learning with the Online Trading Academy there (stock, futures, commodities... ect) They usually are hosting free introductory classes where you can meet a lot of great business owners with free cash flow looking for ways to supplement their income without financing the courses.

If you google their name and reviews you go a whole host of complaints.

I forgot to add- I'm starting to put a team together (in my head and on paper).I went to a Bookkeeping for Business class hosted by the SBDC and met some great people.

I decided to move over to PLG because of the unpermitted work, wiring without junction boxes, lack of insulation and a whole host of shoddy quick flips.