Here's what I'm working with...The property is a late 70's 1800 sq ft brick single family that sits on 1.75 acres surrounded by newly developed 1600 - 2200 sq ft homes which are zoned 4 homes per acre in what I consider a B+ neighborhood.  

@James Wise  Per your request.Coming out of the late 1800s most of the major west coast cities that we know and love like LA  SF  PDX SEATAC were all subdivided by the same engineering firms  at least SF and Portlandia were.. this led to land speculators in the day going out into the Western deserts and other remote areas.. buying what were large land holdings , Spanish land grants and other lands that were not govmit owned.. then in the day you could simply create massive subdivisions buy doing basic surveys off of the base and meridian lines.. which all of the west is surveyed off of... this is called section land.then create these massive tracks of lots.. some were like up in the apple valley, Lancaster,  Barstow type areas mainly 5 acre tracts.. and were done on a grid pattern.. streets in ( mapped but not built)  and of course spiraled out of a small little town off the railroad track or the few roads that existed in those days.. you took your map and recorded it at the county, county was happy they just got 5 thousand lots they could send out tax bills on..

I know for single family homes, it would go by comps in the neighborhood, but apartments I know are different.

If you don’t mind my asking, what neighborhood did you decide to buy in and why?

Good or bad for the community and neighborhoods?

Stick to what's appropriate for the neighborhood. 

Drive around your neighborhood and look for vacant properties.

I live in Allen, and prices for 1300 sqft 3/2 in my B neighborhood have gone up dramatically in the past few years. 

Pick a few neighborhoods within those areas and start tracking as much data as you can. 

I typically buy houses that are in good school districts because in general good school districts have very nice neighborhoods that make the house easy to rent out.