so...I just realized today that I had the hot water heater for the laundry room washing machine off.FOR LIKE TWO MONTHS.I was trouble shooting something and turned the breakers for the hot water heater off. 

I've never really liked the idea of using my primary home as a cash machine, so that's where I'm feeling a bit hesitant, but with rates so low, I'm thinking, if I'm ever going to do it now may be the time.  

I thought that as well but I believe there may be room to charge market rents in the near future as well as adding some additional income via coin operated washing machines. 

The money from the machines covers my rental cost and extra utilities.

This technique is called pipe bursting where a new pipe is underwater in place and as the machine pulls the new pipe it also expands the old pipe out of the way.

How will it compare with revenue from the machines?....

Don't be afraid to bring in a basement foundation repair company and get a quote to get the issues identified and fixed. 20% of 110k =  22k Down110k - 22k =     88k  Financed88k @ 4% for 30 years ===  Monthly Payment of $420  (principle and interest)Other Numbers you'll need:Property Taxes  (get on the county website)Insurance (just call an agent or ask owner)Repairs    ( Really depends on condition of property, 10-15%)Utilities    (get as many months of bills as possible)Property Mgt (even if you plan on doing this yourself)vacancy     (depends on market and property, 10%)LawnCap Ex    (depends on property but sounds high on this building) 15%These are VERY VERY rough numbers but lets look anyway...Gross Rent- 22,500 (assuming all 3 are rented at 625 and no washing machine income)ExpensesP&I-          5,040Taxes-      2,200 ( I figured 2% of home value)Ins-           800    Repairs     2250     Water       1800    (150/mth)          Look into heat billVacancy   1125Prop Mgt  2250Lawn         300Cap Ex      3375Total        19,140  22500-19140=  3,360   Cash Flow YearlyInvestment of 22,000 /  3,360 = 15.2% ReturnPlus tax advantages, paying a little down on mortgage, possibly appreciation, learn a lot.Location, Basement, Local Market, Comparable properties, and firming up numbers ALL need to be looked into.Let me know what you think! 

Many of the rules are being made up right now and there isn't case law about them-Technology - It's hard to make things work for a reasonable price such that you don't have to charge large fees to feed the machine-Marketing - It takes hard work to attract people to your funding platform-Deals/Real Estate - It is hard to pick great projects without inside information or a lot of deals to select from.  

It also syncs up nicely with Google Drive, so you can access all your files this way as well as using all of Google Docs apps.However, it is very limited in its functionality as it does not have an internal processor - everything is run through the machine's browser Google Chrome.  

Another possibility might be adding additional sources of income - renting out the common space/room in the office if you have one, to the tenants for birthday parties etc, vending machines, coin operated laundry, pet fees, pet non refundable pet deposits.