Take care of the tenants and 99% of the time they will take care of you.

What are some tips on what type of property to acquire and renovate that is likely to sell faster?

#2 If the pipes were shared with others, does HOA have to take care of the issue? 

If you are scaling quickly, you may want to consider this decision carefully as it is not fun to switch.

Commercial also tend to have longer leases and the tenants usually take care of more day-to-day stuff. 

The ENTIRE mentality here is wrong.Listen carefully and hoe you and everyone else here understands this.Consider this.I have 15 kids, 4 dogs, 300 chickens, 3 wifes (that don't know about eachother), an uber eats job, and 35 dollars to my name.

Just be careful as the results of the test may embolden the tenant to ask for additional compensation.

There was so much water that we had to use a pump and mini x to get to the shutoff.I am posting this because I want to add some extra emphasis on how important systems and good employees are to your success.I was in Hawaii over three thousand miles away and we were able to get this taken care of without me there and without help outside of our contacts. 

I agree with Bill about really knowing your landlord-tenant laws and vet your prospective tenants carefully if you're self managing. 

No receptacles should ever be knob and tube(today), I don't care how good it looks.