Here in the Seattle area Brokerages, the MLS and the King County Realtors Association regularly publish that sort of data.

I have a property manager and his phone number is published on all our online listings, however I have been getting phone calls on my personal number (which is not listed anywhere in relation to the rental property) asking if I have a 1 or 2 bdr available and so forth.

Keep in mind, true multi families tend to be more expensive than comparably sized single families or single families with ADU's, so although you're approved for more $ its also easy to spend more $ on these properties.You'll also want to consider the difference between a low down-payment conventional loan (5%) and a FHA loan (3.5%, I'd only recommend this loan for purchasing multi families) Since 2014 new FHA loans at 90% loan-to-value or less (more than 10% down), have the monthly mortgage insurance premium payable for at least 11 years. 

There are also newspapers that publish upcoming sales.

They just need to publish a looong list  ;)

@Joshua Lopez Look into "Long-Distance Real Estate Investing" by David Greene, published by BiggerPockets.

There do not yet appear any published legal cases that have reviewed this issue.

@Brandi Graham - Forbes recently publishes an article I wrote on this topic.

They have a LOT of overlays and extra BS, and the overlays aren't all published for the mortgage broker to see.

The tax assessor office website failed to publish the answers to my questions.