Serpong Town Square is a place with an all in one concept. It provides a place to live in the apartment, a place to shop in the mall, and amusement in the water boom. Serpong Town Square is a great choice both for residencial and business area. Traffic jam is one of the most important consideration that can be minimized by living in the apartment, if you are working around Serpong. Serpong Town Square started in July 2004 and finish soon in October 2005. This project has 2 structural parts, basement and upper structure. This report provides general information of the project and the upper structure's processes details, but the focus will be especially on the application of Hollow Core Slab (HCS) as slab structure. The report also gives tables and pictures for clearer explanation.