I am buying land, going to build the house from scratch and sell it.

I then rehab the property and finance it or sell it.

also determine what niche.. keep in mind 85% of agents all do the same thing basically  sell sfr s   there are many niche's in RE..

I want to know you recommendations where are safer areas and where are ones to stay away from.

As well as if it is smart to even have this as a back up plan In most places tax liens go right to the front of the line so there's no real risk to the state/local government and thus no reason to sell them for pennies on the dollar, as they usually can collect everything just by foreclosing.

@Kim LeJeuneIf you lived there and sell shortly after (within 3 years), you may not owe capital gain tax.When you ask about the form, it sounds like you intend to wrestle with forms.

Sell your property and move in with family for a couple years.

If you already own it and it was a personal residence that you don't want to sell providing you live somewhere in the area, have an interest and understanding of your local rental laws and aren't in California (the laws) or Florida (the possibility of assessments) then self management is a possibility. 

My question is, should I sell it now and make $500k+ to reinvest in multiple other properties or wait the unknown amount of time for the property to be sub-dividable and potentially make 3-4x?

Or should I even just cut my losses and sell.