AMCAL Multi-Housing Inc. in Agoura Hills began construction on two greater San Fernando Valley developments. The builder, which specializes in affordable and low income housing, has begun work on a $20.2 million, 55-unit multifamily development in Panorama City. AMCAL has also begun work on a $13.8 million, 81-unit senior housing complex in Palmdale. The projects are due to be completed in 2008.