Our front concrete steps are sinking, disconnecting it from the foundation.

Just throwing a ping pong table on a concrete slab in the garage is marginal.I had an STR buyer in Conifer, in the mountains outside of Denver, turn a massive unfinished walk-in closet into a little arcade area with two comfy lounge chairs and two vintage arcade games.

Broken concrete and curbs on every other home?

Please be concrete and elaborate.

Engage professionals to inspect major components such as the roof, plumbing (including sewer lines), foundation, drainage, electrical systems, HVAC, chillers, boilers, termites, exterior walls, balconies, stairs, rails, and concrete.

.), the location, depth, and capacity of utilities to service the site - including public utilities (sanitary, storm and water services), franchised utilities (power, gas, cable), capacity of the local streets to accommodate additional traffic from your development...Be sure to find out if there are any specific local ordinances you need to satisfy (possible tree & wetland surveys, together with any necessary tree & landscape or wetland mitigation plans) and whether there are any concerns from municipal departments (e.g. hydrant locations from the fire department, storm inlet and retention requirements, as well as asphalt / concrete road requirements from the engineer), entrance requirements from the road commission (left turn and passing lanes at the site entrance), etc.Once you get past all this you can finally prepare a preliminary site plan and enter the political arena to get preliminary site plan approval, and to address any concessions the board and neighbors want from you to overcome their objections to your development.

I had to upgrade the waterlines to 3/4 (ripping out the wall, retiling) and replace the drain line with metal pipe, (dig up floor, plumb, concrete, retile).  

I don't know about cheaper insurance (yet), but at the event I went to, they said that insurance companies were advised/required to NOT price them higher just because they were concrete homes as opposed to regular construction.I do think it's feasible that eventually they'd have lower premiums as they prove to be more durable/less risky.

My contractor poured a self leveling cement over the current concrete slab.

Nothing that is remotely concrete.