Dawn - In our practice, buildings for Stoa Communities are less expensive by at least a 15% margin, assuming the same size building. There are fewer contained spaces with dedicated light switches, doors, systems, etc. Stoa Communities require dramatically fewer hallways. Additionally, most educators that build schools that aren't "cells and bells" models can build smaller facilities, which increases the savings. We have transformed existing school buildings, with the ubiquitous double-loaded corridor (classrooms on both sides). It can be done but yields less satisfactory results. We have completed projects both ways and strongly prefer adapting other kinds of buildings for Stoa Community schools, rather than old school buildings. This alternative is usually less expensive, anyway.