Repaired the foundation ourselves. new roof, new hvac, lots new plumbing, new everything, added an egress in the basement to make it a 3/3. 1970s house brought to life in 2020, covid not included.

Upon going to the city to get the permit, I went ahead and decided to pull all permits for work being done (things like a 2-door to 1-door garage conversion, with load-bearing wall removed, kitchen wall removal, new pantry created, turning the old pantry into a laundry room with new plumbing and a sink, extending a shower and tub into a 9' shower, and a lot of other stuff, including a lot of electrical changes like a new outlet and new light fixtures).

Drain ties to the plumbing but if that it not possible you could always have the drain flow to the outside of the house similar to a condensation overflow line on the AC

They were not only renters, the had a plumbing business and I relied on them quite heavily. 

) $2,000 10 $200 $16.67 Landscaping $1,000 5 $200 $16.67 HVAC $3,500 20 $175 $14.58 Flooring $5,000 30 $167 $13.89 Roof $5,000 35 $143 $11.90 Structure (foundation, framing) $5,000 50 $100 $8.33 Plumbing $3,000 30 $100 $8.33 Windows $5,000 50 $100 $8.33 Water Heater $1,000 15 $67 $5.56 Driveway/Parking Lot $2,500 50 $50 $4.17 With a new build, you're obviously starting at the beginning of the useful life on everything so I would remove cabinets, HVAC, flooring, roof, structure, plumbing, windows, water heater and driveway.

Friend of mine has a buddy who has a plumbing business in Charlotte.  

You'd need all the plumbing along with egress windows.

As a landlord, you must remember that you have a lot of obligations you must uphold if you want to stay in business.You must take care of plumbing and other repair issues if your renters run into problems along the way.

Depending on the work done, this could result in things like plumbing leaks, paint jobs so bad that there is no returning the unit back to original quality, etc. 

The only thing we have on our side (kind of) is that the house we are buying had about 7-10 minor (water heater, potential mold in attic, faulty plumbing in sink, moss on rough, etc.. issues that the inspector called out.