Now let say I have remodeled my rental and the cost consisted of new floor $3000, new windows $3000 and new stove $2000, new fridge $2000, new washer $1000 and new washer $1000.Assume that my rental's SHST amount is $6000.  

Replace plumbing valves and hoses, washer hook ups, pull and clear drain traps.

Also, adding washer dryer hookups bring nice rent premiums.Also, to do value add projects like the ones I described above cannot be done cost effectively in many neighborhoods. 

A lot of cities & towns offer rebates for upgrading things like toilets, shower heads, clothes washers etc to low flow energy efficient items which make the initial cost of replacing them easier on your wallet. https://www.energystar.gov/rebate-finder

(Think if water was here where would it go to escape, sound is similar) I used Gardner Bender 1 lb.

You can make minor adjustments based on the type of appliances (dishwasher, clothes washer and dryer, air conditioning, etc.) and the size of the rental.

Major maintenance items to watch for on older sites are roofs, especially screw down roofs with failing rubber washer screws that fail (steel roofs are maybe a 30 to 40 year product), driveways at the end of their lives, doors and door springs (the older ones were more prone to rust if not maintained, newer ones tend to be better lubricated or coated).

I think If I was her I would tune up my insurance that is where I would be spending my energy.. who knows how long the house has been vacant and unless ( as you know) you have a vacant home RYDER if that house now catchs fire and burns to the ground its uninsured and it will be a total loss.. ( I know it happened to me  I speak of personal first hand experience )..

He included all the supplies (drywall, kitchen cabinets, tub, vanity, toilet, paint, floor, lighting, doors, installing washer/dryer hookups).  

If needed, update faucets and replace all hoses, pipes, washers, seals, etc. if I do.26.