Stay in the job and snowball all my mortgages and let life coast or get off a job still snowball slowly and live life slower.Initially, when I purchased my first apartment building 10 years ago, I did it because I was curious.

I am attempting to build a new house in san francisco, Ca . 

Not sure your strategy here but just throwing some ideas your way.Check building permits to see what's happening in town.

For SFH New Tampa is good if you're looking for newer builds, I also recommend Carrollwood and Citrus Park for SFH as well as the others I stated. 

Find properties such as duplexes, triplexes, and small apartment buildings on BiggerPockets Marketplace and local listings.

I dealt with this for months until my inability to find a large construction company to build a double sided fire escape on this property forced me to sell it.

As long as you can document two years of work/income, yes (All things being equal).

I told them that it was a better idea that, instead of buying a home first, we can buy an investment property and keep renting after we build some equity, sell it and put the down payment for 2 houses or a duplex and live in one and rent the other one (for me, i could keep renting until we buy a lot of investment properties and then move to one of them), but my family wants to buy a home firts and then the investment property.Can someone give me a light of what is better or the pros and cons.Thank you so much.

I intend to build a portfolio of different property types.  

You can offer to lend the seller money to stop the foreclosures. 7 or do a lease with an option to buy - making up the back payments that would be considered you advance lease payment.Always look at the property if you have intentions of bidding at the auction (this can be tricky because you need to do that with the owner's permission - do try to build a rapport with seller  - also look at the foreclosure suit to find out what the bank is looking for and if there is a second mortgage or other liens.At the court house steps when the auction take place you need to be well prepared with your certified funds but more importantly you need to know the fast sale value of the property - you don't want to pay retail.Get to know your competition - there will be professionals at the foreclosure auction looking to capture some serious equity.