the 6500.00 tax credit is available for single family homes, there is a different credit for multiple family homes, but at least one unit must be owner occupied.
depends on how it is used, traditionally the acronym is used for "principal place of residence"
It all depends on the type of soil underneath the top soil. Traditionally loose particals, sand and dirt can wash away. Traditionally in high clay content areas, ohio, north carolina ect there is no problems. What state is your home located in?