Here's how realtors described Crown Heights in 1943

Pretty much how I describe Crown Heights today (though I peg its western border at Classon, not Franklin).

I find it interesting that the term "Crown Heights" does not appear even once.

all the way down to lefferts? that's interesting. ive always heard that the northernmost border of Flatbush was somewhere along the middle of the botanical garden, not more south

That's true, but the analysis is of the area around Eastern Parkway straddling  Crown Heights and Flatbush.

Yes, the writers seem to believe that describing the area as Eastern Parkway makes sense to their readers.

It looks like Eastern Parkway didn't run up and past Atlantic back then either.

The part of EP that goes east of Ralph is technically "Eastern Parkway Extension".    I am not sure when it rec'd that designation.

EP between GAP and Ralph was finished in 1874.   

http://www.nycgovparks.org/parks/eastern-parkway/history

Rents and housing prices work pretty differently now— many of those 2-families in southern Crown Heights were the most expensive then, and seem to be some of the better deals in the neighborhood today.

It's also interesting that the area around Grant Square is already tending toward low-income— it was clearly quite wealthy when first built, though that was probably 20-40 years before this map was made. I guess the rich people already required garages by then? And I suppose 30-40 year old architecture is too new to be historic and too old to be fashionable.