Since they have a free 7 day trial, if their filters work for my needs, they might be a good place to gather the data I am looking for.

I know that there are major regional variations in costs (especially land), and building materials (and labor) are much more expensive than they've historically been, but I'm starting to think that a new build might come out more favorable than an existing structure even so, given that the prices on existing places is so high.I'd like to build a standard class-B property with 4 large-ish units (1200sf) within commuting distance to downtown Phoenix.  

Just wait till you refinance out of a WHEDA loan and do another one or some variation of an FHA low money down like 3/3.5%, but you have to live in it for a year, etc.

You can also use Propstream (there is a monthly fee but you can get a free 7 days trial).

I've had success on Facebook Ads but it was trial and error.

To me it looks like it may just be better to schedule service every few years plus hit and trial to get tenants to change filters.

you need to fully work out what is possible with the property you have so that you don't waste money on trial & error. 

@Nabin Mandal - I still think it's more of a trial and error process overall....1.

Do the 7 day free trial?

Sometimes the location of the property makes LTV variations.