Until recently, repair and retrofit options were limited and costly. The usual solution for a sick building is to add steel beams underneath sagging floors and a concrete topping. But while this method may achieve its objective, the cost, disruption to utility services, and unsightly steel work may be unacceptable to building occupants and owners. Rather than face these obstacles, some owners opt to tear down and start from scratch. But now there is an alternative to these methods. External post-tensioning (EPT) has been successfully applied to repair or retrofit about 30 concrete structures in the United States.