List Criteria for Acquisitions Marketing

Hey guys!

For those of you building marketing lists for apartments, which sites and what criteria are you using? We put one together through ListSource using criteria of "Residential: Multi Family" and "Residential: Apartment" and 95% of results were duplexes and quads... 

For those targeting anything in the double-digit unit count, what have you found to be the most successful way of getting good data?

Thanks for the help!

Cheers