The American Repertory Theater (A.R.T.) is on the brink of a transformative new chapter as it prepares to establish its new home in Allston, a project that promises not only to redefine the theater landscape but also to contribute significantly to Boston’s creative ecosystem.Recently approved by the Boston Planning and Development Agency, the A.R.T.'s innovative 70,000 square-foot center will feature cutting-edge performance venues and rehearsal spaces, setting the stage for the next wave of artistic exploration.