selling off bonus FAR- Floor Area Ratio?

[Amy R.]

Hello Investors who are smarter than I am!  Good morning,
I am hoping someone can help me understand what it means to sell off bonus Floor Area Ratio? I am much more familiar with thinking about zoning...  Looking at a plex with bonus FAR that can be sold off.. does that mean additional building development is possible on the lot? Or??  I have done some searching but am feeling really confused here about what the possibilities of selling off the additional FAR might be..  Thanks for any help here!