There's no reason to not try to prequalify.... there's too much data out there, to not at the very least narrow down to the last sale date, property type, homestead-y/n, if it's in one of the new-fangled city affordable housing plans or not... the list goes on and on.Go to the county website that you are prospecting in, and look in the 'open data' section for the parcel/tax dataset.

Found it by prospecting over the phone.

Prospecting and cold calling How did you finance this deal?

Consider holding a "rental auction", looking for the prospective tenant who will and can pay the most rent or who can and will do the improvements you want.  

Question for those who've done this and tracked results:  Do you think I'll be better off sending to More houses, less times, like 600 prospects twice a year, or are results better to send to less people, more times, like 300 prospects four times a year?  

The prospective tenant has offered a pet deposit (it's illegal to require one in our jurisdiction).

That means your pool of prospective tenants will only get smaller if that trend continues, and there's no reason to think it won't.I hope I'm not discouraging you with my post. 

Then at that point, continue with another candidate.My pre-screening starts out with asking the prospective tenants to give me a copy of their Credit report and Score from one of the free credit reporting websites such as Credit Karma.

I did not let one tenant keep a mastiff puppy that they snuck in then had to turn down a really great prospect with a tea cup poodle.

Know your zoning and get permits now to save yourself from problems in the future.