Surely this could be an issue with the foundation of the house soon.I reached out to the builder twice by email and once by certified mail and there has been no response. 

I just sent you an email, thanks!

I don't know what the market like is in SoCal but I would imagine that contractor costs aren't much less there in LA area than the Bay Area.With @Dan H.'

They could even log into the Google email account associated with the account and send questionable emails, upload photos of who knows what to Google photos, etc.. 

I'm getting good results for our clients with postcards and some paid ads, but I'm looking at implementing cold email and cold calling as well.Any good companies to buy lists from?

You can text/email/call or even see them before allowing them to move in.

I am hearing from a number of sellers (mostly developers) who are clearly being forwarded copy and paste emails from buyer agents evidenced by questions that aren't even relevant to the properties they are selling.

Except their customer service is only through email.

This was back in late 2022 and I think it was new for them at the time so I imagine they still do it.  

I've been doing this since the 70s and I've had every loan you can imagine.