You can complete a Cost Segregation Study on a property outside of the US if the holding company/entity is within the US.  

I also am going to forgo the property management and do this from out of state and see how it is.

Can I put up cameras on my multi unit property? 

Having them rent for a 4th year (assuming you lived in it immediately before for 2+ years) will put the increase in property value into cap gains. 

We had already been planning to do some maintenance and repairs (repave driveway, re-insulate attic, replace two broken faucets, other minor items), but were wondering if, for tax reasons, we are better off waiting until we close on the new home and this is no longer our primary.Can this work count toward tax deductions as preparatory work on rental property, even if it's currently our primary?

I’m up ideating another strategy idea for the property & Greenville.

The only difficulty is I’m trying to find a multifamily property in an older housing stock area but nonetheless an owners unit inside a larger house is the goal but hopefully I can get lucky with the items you pointed out as well. 

That is, who actually owns the property while the work is being performed?

Fully Renovated Turnkey Cash-Flow Investment PropertyRental property's income at least 1% of the purchase price.Continuous profit with little hassle.45 minute commute to the state most vibrant city Greenville and the state vibrant capital Columbia South Carolina.Nordson Industrial Coating Systems (ICS) is establishing their newest manufacturing facility with an investment of $30 million.

I personally wouldn't buy a condo as an investment property unless you don't have a primary residence and plan to house hack it (e.g. buy a 2 bedroom and live in the unit and rent out the other bedroom).