Though you save money on franchise fee laundry staff.

We converted a laundry room and hall closet to a 3rd bathroom (handicap accessible) and converted one living area into a large bedroom.

Summer we are near 100% but winter is ~25% making our overall performance about a wash due to management costs associated with the short-term rentals. 

I'm thinking 4M in net worth would be easier to achieve than 400K in annual net income.Then again, there are businesses that throw off a lot of cash, full service car washes come to mind.

Laundry, I've never provided but if I did it would be on a "monthly  rental" type of basis.

Successful agents list properties and have a bevy of wanna be agents on their "team" who show buyers properties until they wash out or get their own listings.

BEDROOM ONE:Build a new wallCheck window are for leak, subfloor looks wetBEDROOM TWO:Replace the sub floorMASTER BEDROOM:Move electrical panelNew walls around the large master bedroom closet replaced due to water leak from ACReplace subfloor because of AC leak causing wood rotMASTER BATHROOM:Replace subfloor in master bathroomRemove window from master bathroomAdd a vent fan to master bathroomAdd plumbing for another sink in old closet and replace subfloor due to wood rotMove plumbing from shower and toilet around.KITCHEN:Add recessed lightingMove AC ventWATER HEATER CLOSET:Make a new door for the water heater, which will now face the back doorRemove light switch for old laundry roomOLD LAUNDRY ROOM:Built in shelves.

Price seemed to be a wash.

Other than that, just plumb in a bath and kitchen and laundry and your g2g.

Dont turn the water on at all until you can get in the house. and then have people stationed on each floor to listen and watch for leaks.OMG what a RISK. even with a house being properly winterized by a so called professional company things fail.Just to mention a few,, outdoor sill cocks.. dishwashers,, ice makers in refrigerators, washing machines, and radiators. to mention a few some forget,  any and everything that's had or supplies water in it is potential for a leak and you won't know till your there and turn it back on.When you do turn water on DO it SLOWLY,  have faucets open and as water starts running and air is forced out then turn off each faucet.