This project involved a Detailed Seismic Assessment (DSA) for 40 Eden Crescent, Auckland. The primary purpose of the investigation is to assess the seismic performance of the existing building to determine if it satisfies the requirements established in the Building Act 2014 and the current standards for existing buildings. The assessment identified some improvements that are required to meet those standards including the removal for parapet blockwork and shear strengthening of blockwork walls. This assessment determined whether proposed modifications (the addition of one or two levels of timber on top of the existing roof) are achievable or not, and proposed a strengthening concept to achieve the desired alterations.