I'd tell them you will buy it and install it, however, their rent will be increased $X a month to cover the fact that you've now supplied a washer and dryer. 

Depending on where you are investing you may have seen 100k increase or even double.

Some are too busy and don't want the work.

My tax lady charges $250 for my business return each year.

This is an admin fee that covers the increase expense and headache of marketing, showing, screening tenants, etc. - Tenants are responsible for the rent until the replacement tenants move in or the end date of the original lease. 

STR Achievement Unlocked: I have a business partner who has an AI bot filling last minute vacancies on FB and, because sometimes it was too late for the canceling guest to get a refund, he sometimes runs occupancy above 100%. 

But I want to learn how to invest in real estate as a business.

It has a tenant facing portal where tenants can pay their rent, which the app deposits into our account the next business day (even though ACH payments do not regularly settle for 4 days!).  

Maybe 1-2 hour class, so check with your local authority who runs the sale to see if they offer a class.Last thing to remember it is pretty much a cash business. 

But my business partner who has a sales background has brought in $25M.