Prop 19 Parent Child Exclusion for Multi-Unit Property

[Michael Theo]

Does anyone know how the Prop 19 parent-child exclusion applies to multi-unit properties. My parents and I occupy 2 units in a 4 unit property as our primary residence. If my parents transfer the property to me will the exclusion apply to the entire property or will it be pro-rated (given that 2 units are rented to tenants)?