Ann and Phil work for Broker Don at Hammond Realty. Ann lists a home for $150,000 and Phil sells that home for $145,000. In this transaction, what will Broker Don be considered?

Hammond Realty

In this transaction, Broker Dan will be considered to be the Principal Broker and owner of Hammond Realty.  This can be inferred from the statement that "Ann and Phil work for Broker Don ..."  Were the statement to read "Ann and Phil work under Broker Don  ...," it would have implied that Broker Don was their manager.  "Working for" implies that Hammond Realty is a sole proprietorship owned by Broker Don.

Explanation:

A sole proprietorship is a business entity owned by a person.  It is usually not legally separate from the owner, moreso, in tax filing and accounting.  Hammond Realty is not a separate legal entity.  It is part and parcel of Broker Don.  And Broker Don owns the assets and is responsible for the financial obligations of Hammond Realty, to the extent that he would be required to settle the liabilities of Hammond Realty with his personal assets, if Hammond Realty fails.