Project brief: LULU is 10 000 SF multifamily 4 story residential projects in Sofia, Bulgaria. There are 7 apartments, and an office on the ground level with garages. Each floor has two apartments. The project explores new and innovative materials, such a fiberglass concrete, not only for building more organic design and aesthetic, significantly lighter and higher in tensile strength, but also as an opportunity the buildings to become more sustainable. For example, the glass elements in the concrete usually are from reclaimed or recycled materials, and the cement mix includes fly ash, silica and which are also sustainable materials, with no adverse effect on the environment. Currently the building industry accounts for approximately 40% of global GHG emissions (WBCSD 2018). As architects is our responsibility to rethink, not only how our buildings can be more aesthetically pleasant, but also how can be more sustainable and environmentally friendly