Go add a bathroom to a C/D property vs a A-/B+ property, you'll pay the same amount but get a way better return.

New roof, exterior painting, new flooring, bathroom updates, finished new living space What was the outcome?

While metrics like square footage or price per square foot matter, the number of bedrooms, bathrooms, and overall location are often more critical for attracting tenants.Engaging a property manager early on can save you from costly mistakes and help you invest in properties that perform well in the rental market.

You might want to consider adding another bathroom if possible. 

Sometimes the contractor will put a % on the top of the materials to source it.2) what's your range for remodeling a bathroom?

Added a bathroom and remodeled existing.Opened kitchen to diningNew roof, driveway, windows and mechanicalsRefreshed landscaping, hardwood floors and paintWhat was the outcome?

I flew there and walked the house, looked pretty turnkey rental grade): $1029 GFCI outlets, downspouts and guards, drywall, paint, bathroom vent$4615 (new AC unit since unit was stolen before tenant moved in, didn't file insurance claim because didn't want my premium to go up) $600 (water line, gas line, P trap)$60 lawn mowing$112  thermostat repairMy opinion is that Class C is better for local investors who are on site and know how to do repairs and self manage.

This followed after a 2X overflow of a tenant on a first floor that flooded his bathroom using a portable washing machine and flooded the basement apartment.

Ideally you have not replaced roof, hvac, flooring, kitchen, bathroom, fencing, windows, foundation repairs, hard scape repairs, electrical, plumbing, etc.  

Planning to start a complete home remodel (interior/exterior) on a home (currently 837 sq ft), kitchen and bathroom bump out, and add an additional bathroom.