Masonry buildings made from passive stone/brick materials are acceleration sensitive and vulnerable to seismic forces. Current construction practices see a surge in use of light weight Autoclaved Aerated Concrete (AAC) blocks. This paper studies dynamic behavior of semi-engineered AAC block masonry building models under shock loading. Two half-scale models are constructed practicing half-block joint (English bond) and full-block joint (Stretcher bond) on a unique semi-automated shock table facility. Dynamic response of long and short walls of building models are measured with reference to base excitation. Building model built with stretcher bond survives despite suffered with heavy damage and perform better than model with English bond which collapsed under series of shock loading. Long walls of models observe major damage due to out-of-plane bending modes, shear cracks and vertical separation at wall junction. Peak acceleration response of long walls shows reduction with progression of damages with reference to base excitation. Performance of AAC block masonry building is found to be at par with red-clay brick masonry building studied previously.