(PK) = Primary Key
(FK) = Foreign Key

Building(buildingNum(PK), Description, instname, buildName, state, postcode)
User(UNum(PK), buildingNum(FK), Surname, FirstName, initials, title)
File(FileNum(PK), title)
UserAccount(FileNum(PK)(FK), UNum(PK)(FK))
Job(JobNum(PK), id, title)
Interest(JobNum(PK)(FK), UNum(PK)(FK), Description)

select B.buildingNum, B.BuildName, B.instname
from Building B join User U
where B.deptNum = U.deptNum in (select I.Description
                    from interest I
                    where description = null);