The document discusses establishing new relationships and sustainable business models in construction and real estate through a "cradle-to-cradle" approach. This involves separating base buildings from fit-outs so resources can be reused, and dividing ownership between users and investors to address the "split incentive" problem. A new study aims to define these concepts legally and fiscally, propose new principles and contracts, and establish technical standards for a circular construction economy. It seeks €400,000 from public and private partners over two years to research new sustainable business models and economic concepts.