I realize this is by design so if there is no way to see it, can anyone offer details or opinions on why it's great and why I should buy it?

Give us some data.....where are you, how much do you have saved, what is your purchase price, min ROI, Etc...?

You can pay someone to scrape the data for certain types of units in a market. 

@Mike Khalil Hi MikeThe current zoning of the property and the uses “by right” allowed under that zoning designation define your development options.If you want to pursue a use other than what is allowed under the current zoning,You will need to rezone the property.If you choose to do a small retail project you should figure a 3:1 building ratio.

The data I see breaks down Brooklyn into quadrants but not specific neighborhoods...

Big shout out to Anson Young, his book Finding and Funding Great Deals has to be one of the best hidden gems with process driven systems for finding off market properties using listsource.com and other methods.1.

Rents have gone up more than I thought and a lot of novice landlords have been driven out and sold.  

That is like saying you have driven drunk before and didn't get caught, so that means it is legal.

Fully renovated both levels, 2 2/1s mid century modern design.

If you put in the location, you may get a response from a property manager who can help you, or just someone in that area that can help.There are BP forums for people to connect based on locality as well, even if there's none for that particular county, you always can start one yourself on BP.Another place to look for a property manager is the National Association of Property Managers, there are designations in this industry (like Residential Management Professional (RMP®) that are supposed to help you know that a property manager adheres to certain standards and has documented qualifications.See https://www.narpm.org/