While the property requires renovations, inspections and estimates have been completed, and construction is now underway.

An inspection report is also a good idea.

Like most states, Georgia gives you the legal right to enter for inspections, repairs, or showings.

I can but to be clear I never buy a property without at least inspection contingencies.

do I now Request for Tenancy Approval (RTA) form so HUD could come inspect the property and starting collecting rent (assuming inspection is passed)?

After you are approved you will have 7 days for the inspection and can walk away in that time space.

I think this would make sense in the long run for the rental property as it will extend the life of everything it touches like the Sink, faucets, showers, water heater, dishwasher, and Clothes washer while also providing clean drinking water in addition to the reverse osmosis drinking water system I already have installed.The main problem with this hardness level is that we get a major deposit buildup on all of these items, which will eventually clog up the faucets for tenants and lead to rusty shower enclosures that take forever to clean.In addition to this, it looks like we could likely have the salt added every couple of months by the property managers in addition to that it would allow for a quick inspection from them, and then also we would instead bill the cost of the service onto the ledger for the tenants.For reference, it does not look like the landlords in the area have water softeners.Thank you everyone for your input ahead of time.

Let's assume there is no CO obtained immediately after the sale (will do later after repairs are done), and no township or local-level inspections requested.Is the township automatically notified by the county of the sale or is there some mechanism by which they would learn about the sale and update their records, other than by the buyer telling them about it, or applying for a CO? 

I sent certified mail mid september that was returned from the post office. i eventually flew drove down to the property in beginning of October to post eviction notice on garage and front door. i inspected the property that seemed half way abandoned.

The customary California purchase agreement includes a contingency for the physical inspection of the property, so you will grant the buyer and agent access to inspect the property during the contingency period.