Surveyor, landscaping, financing, legal, plumbing, electrician, drywall, insurance, city/county zoning, inspectors, title search or insurance, etc. 

@Scott Lyons I have used Calla Plumbing for years, they do a great job and are quick

Plus some larger capital expenditures including replacing galvanized plumbing with PEX (plus individual unit meters) and minor roof repairs.

Upgraded electrical, plumbing and hvac systems as well as the structural integrity of a property are more important the the actual age of a property.

I've rehabbed properties to the studs/pulled out all electric/plumbing/hvac and rebuilt from the inside out. 

I had 11 of these and good systems in place but still had 1-2 evictions a year and 3-4 big things that were normal annoyances like plumbing leaks, damages from hurricanes, or some vandalism.

Similarly, our skills don't typically go into deep technical electrical, or entirely re-plumbing a unit.

I learned I pretty good at laying down flooring and fixing drywall but I really have no business doing plumbing.

I learned I pretty good at laying down flooring and fixing drywall but I really have no business doing plumbing.

The building is listed around 750K and the renovation budget would be around 250K (new electric, plumbing, kitchen, bathroom, windows (old ones are lead), HVAC, garage, removing lead paint, lead pipes etc...).