In addition to STR'ing the main house, he is building 2 more units (ADUs) on the back side of the property.

I saw that the population grew by 5% from 2020 and I haven't seen much development as far as new housing goes so what could be causing this uptick in time on market? 

No taxes, she got to keep the house and no stress about income.

That journey started in 2016 when I bought a duplex to house hack.

@Angelica Byrnecan you just save up enough until you are able to house hack? 

The house is a smaller colonial with 3 beds and 1.5 baths.

Which is why I think house hacking is best for 90% plus of new buy and hold investors.I wrote an article on this a while back that goes into more depth and you might find that helpful: https://www.biggerpockets.com/blog/get-a-loan

During those 10 days, if they find issues they want repaired, compensated for, its negotiated.

You are missing my point on taxes.Scenario 1:  Your partner buys the house at the same time you put your cash in.  

But to answer your question, House canary is good for rent rates, zillow is a good tool for property data and for seeing what is for rent for how much, sales comps etc.