Sub-landlord vs. Landlord and security deposits

I am trying to find out what differences exist, if any, between the laws stipulating the manner in which the prime landlord or sub-landlord are required to handle the security deposit. In other words, if it is not otherwise stipulated in the lease, is the sub-landlord bound by the same law as the prime landlord in Massachusetts, or can he or she do whatever she pleases with it?