This paper deals with the analysis and design of high-rise buildings with post-tensioned slabs. The structure was analyzed and designed for a typical floor. Drawings and other specifications are studied with reference to National Building Code (NBC). Designing structures is a major aspect of Civil Engineering. In further development we use additives and plasticizers, etc. and the building materials change from day to day. In ancient times, buildings were built only from the first floor. i.e., an independent house. At present we are building with steel and more than 13 floors, due to scarcity of land, high price of land and urbanization etc. For the construction of high-rise buildings, we are now moving on to claims and post-tensioning methods. In ancient days materials such as lime, mud, kuchar and surhi etc. were used. Presently buildings are built with materials like cement, sand and steel in their improved forms.