@Ron Drake , Zillow no longer auto feeds from our MLS we have to manually upload them again.

Problems arise when the buyer doesn't do enough homework, makes promises of 'saving her credit' and such stuff, possibly charges an upfront fee, moves forward with offers/contracts... only to find out that there are other liens (e.g. taxes, second mortgages, mechanics liens, etc.) and the buyer bails out.

For more intrusive (expensive) upgrades, if necessary, then windows, mechanicals, wall insulation, appliances, non-offgassing and recycled / recyclable finishes. 

It is common to find a separate hot-water feed to each unit if the water heaters are located the basement or a mechanical room.  

It's going to need new electrical/plumping/mechanical since it's almost 100 years old.  

I went with the HC71SB Auto Setback Thermostat.  

You need to ensure you would have properly documented enforcement mechanisms to protect your investor in the event of a default or should something happen to you.Not spending a few hundred dollars to do something correctly, when the cost of incorrect execution could be tens or hundreds of thousands of dollars is just plain foolish.

They can also send the proper legal notifications if the borrower stops paying.The mechanics are fairly simple, find a buyer that wants a house but can't get credit.  

Although it worked for Dick Proenneke (A diesel mechanic from Alaska)

If you're looking for something for yourself you'll want to ask about the condition of the major stuff: roof & mechanicals (furnace/ac/water heater), and if there are any obvious repairs needed.