Urban parameters

Hello,

I am trying to experiment with different urban parameters for a planning project. I have a list of closed curves (building sites), to simplify, they will all be rectangles:

-Cull the ones that have less than a given area (done)

-Cull the ones that have a "street front"(edge) lower than a given lenght. I am having trouble on making grasshopper identify the edges  that opens to the "road" (see attachment 2)(note: it will not always be the shortest edge.)

-I was thinking on making the "road" into a line and somehow the closest edge of each curve will be the one closer to the line. I am having trouble doing this plus this would only work if you have a single "road" and not many blocks of building sites. Does anyone have a better idea?

thank you very much