owner-occupancy requirement:
either the primary dwelling or the second dwelling unit must be occupied by the owner of the residentail lot.
if neither of the units is occupied by the property owner, (如果房主没有住在两个单元中任何一个单元，)
the approval of the second dwelling unit shall terminate immediately 第二个单元的准许（出租？）必须马上结束，and
the unit shall not be rented, leased or ocupied as a separate dwelling. (那个单元（the unit refer to second unit）不准许作为单独的单元出租或者住人。)
1 owner 2 rental OKAY
1 rental 2 owner OKAY
1 rental 2 empty OKAY
1 rental 2 rental (same family) OKAY (not as a separate dwelling)
1 rental 2 rental (different family) NOT OKAY (as a separate dwelling)
