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

Options you might think through would be appreciation - is your area / property  appreciating to where it might make sense to hold onto the property for it to build value.  

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 have preforclosure and probate leads within most counties in Illinois and with over 50% equity.

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

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.

The title company did a search and found out the sellers haven't passed a electrical and mechanical inspections and owed money to the county for delays.

Build prices today depend on who your builder is and where your building is including real estate prices etc.

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.