Life and the school of hard knocks has taught me some expensive lessons.  

You can order that here:https://www.njportal.com/DOR/businessrecords/EntityDocs/StandingCerts.aspx (instructions)You should be able to knock all this out yourself in a day or so.

If you only have enough resources to mail to your list once, you can either save up more before starting or practice some scripts and go door-knocking.

If I want to be absolutely sure about rents, I will go knock on doors and ask people.  

I was considering just door knocking and asking local folks if they would use the laundromat or if they already had access in their buildings.

I'm doing a flooring project in a bit and was able to knock off 35% of list price.

Have you tried door knocking or driving for dollars?

You could also call homeowners, door knock, networking with wholesalers (or anyone into RE) etc. 

I use the tax records at the county recorders office , Direct mail , Google owners name & property address , Facebook , Door knock neighbors , BeenVerified.com & then a P.I. in that order .  

@Todd Dexheimer, you'd better be knocking on wood when you say that:)I just did some cross sectioned analysis for a client based on income and appraisal taxation coupled with growth patterns.