The building boom is probably at its lowest now (not that I would invest in property in this part of the world anyways given that the rules on ownership can change literally overnight).

If the package matches or exceeds your current gross salary (before taxes and deductions given that your home country deducts these) AND provides private medical, transport for all family member once a year to your home country and school fees and housing (all housing, not an allowance). It is probably worth considering.

QP is considered a good employer, but everything is relative. I don't know anything about ASTAD.