Electrical, plumbing (the main items), plus cosmetic work painting and some new appliances.

After they move out, it takes time and money to clean, paint, etc. even if units look decent. 

Full home remodel including kitchen, baths, floors, paint and landscaping.

Your positive cash flow is $840/month, a one month vacancy on tenant turnover combined with the need for interior paint and maybe a few other repairs/upgrades will wipe out more than one third of a year's income. 

It’s amazing what sanding, fresh paint, and new hardware will do.

Needs new kitchen, bathrooms, tile flooring throughout, paint, light/fan fixtures, HVAC unit.

If small, caulk and paint will take care of it.  

A bunch of finishes to make it look pretty (drywall, paint, floor tile, cabinets, countertops, light fixtures, backsplash, sinks, faucets, bathtubs, etc)Not much else to it. 

This super cute house has new roof, new plumbing, electrical system, interior/exterior painted, double pane windows, ceiling fans throughout, new doors, new kitchen cabinets, new light fixtures, wood floors, granite kitchen countertops, new stove, exhaust and back splash.

part of my question is from https://www.themoneycommando.c...2- I have read in the Rental Property Investing book by Brandon Turner that during the Due Diligence of a property the buyer should be checking for Seller Disclosures, Seller Tax returns, asbestos, lead-based paint, plumbing issues etc..