Say you find a property that is for sale, use street view to see the house in none staged photos, natural light, etc and stumbled upon the property next to it. The Property next to it is boarded up, run down, and overgrown, but in an up and coming neighborhood. 

What/where is the best place to find information about this house? 

Secondly, 

In determining future potential rent $ amount for a property, does the 1% of sell price typically hold true? Is that a good metric to use in determining a $ amount to subtract expenses from? 

Thank you! 

@Luke Smith

You can find the information of the property owner on deal machine by searching the address.

As far as the 1% rule it would really depend on your market. If you are able to use the rental calculator on BiggerPockets that is a big help.