They’re not lovin’ it!  Councilmember Laurie Cumbo agreed to support a proposed development in Prospect Heights after the developers behind the project agreed to shrink the structure’s size — but members of the local community board still rejected the proposal, which would provide over 250 housing units on the site that currently houses a drive-through McDonalds.  Builders with Atlantic-Vanderbilt Holdings had proposed an 18-story building at 840 Atlantic Avenue, at the intersection of Vanderbilt Avenue, which would have brought 300 apartments, with around 95 slated to be income-targeted affordable units.  After backlash from the community, and Borough…