We’ve noticed water seeping issues through the shower tiles, causing damage to the sheetrock in our only bathroom on main floor.

Cost for real estate here is high, I’m sure there are deals to be found in and around the area.

(After selling a few, I may do another house plan or turn some into rentals)I’m hesitant to build any with materials being so high but I figure if they buy it before it’s built my risk is mitigated.

There are a lot of condos closer to the water and I wasn’t sure if those were long term or short term rentals.

The potential risk of foundation movement and settling in the neighboring unit is high and they will be looking for compensation for any issues your underpinning job causes.

The other option would be to purchase the property strictly as a rental unit; nowadays, lenders are willing to go with 15% down; no income verification, and perhaps the rate be favorable in the high 7% to low 8% interest rate.

The LF of the Underpinning came out to be about $440 a LF on the low end and $1,690 LF on the high end assuming a 2' undercut. 

I know I will have to go three or so stories high, but how do you decide on the what density to propose to the city?

You dont LOL, the N east is crazy high with very low returns and terrible to landlords.

When those illegal immigrant is working  it gives pressure to wage so it reduce inflation, but also reduce unemployment.Since unemployment is reduced, there's not much pressure for the Fed to reduce rate.