It depends on the modifications too, wider doors, open cabinets, pull under sinks, reinforced ceiling attachments for slings and bars, larger bath rooms, roll in showers, exterior ramps, van accessable garage with additional space and ramp, bed and bath alarms and open floor plans are hard to find.

New floors, paint, doors, ceiling fans, added a barn door to the extra living room.

Purchase price: $245,000 Sale price: $435,000 Complete floor to ceiling remodel!

A 7' long, 4" diameter branch javelined itself through the roof, through the ceiling, and into the living room of the trailer.  

However, a large number of holes in the walls or ceiling that require filling with plaster, or that otherwise require patching and repainting, could justify withholding the cost of repainting from the tenant's security deposit.

@Camille Joos-Visconti I think if you become someone's colleague on BP, you can send a direct message.To answer your question, I spent $50k on remodeling the entire 2-bdm apartment, including new sheet rocks, ceiling, paint, kitchen cabinet, countertops+all new appliances, new flooring, new bathroom, re-finished all doors, new recessed lights....but I learned that I could save money on hiring a good GC, instead of negotiating with individual sub contractors myself. 

@Reginald Guercin  If you are interested in acquiring properties then tax deed auctions with a set ceiling is a good way to get started. 

I and the basement tenant are worried about ceiling coming down. 

A little bit of landscaping, rebuilt the kitchen floor and ceiling and remodeled both bathrooms in the unit i lived in.

Floor to ceiling mirrors glued to drywall.Tenant installed wood baseboard.