Joe Jackson, a real estate developer, would like to exchange his plot of land in Nantucket for a small apartment complex located in central Massachusetts. The apartment building is currently owned by Sam Tower. The fair market value of the building is $1.8 million and Sam's basis is currently $1.3 million. The property also has a mortgage balance of $600,000. Joe's land has a FMV of $1.2 million and is debt free. Joe's basis in the land is $900,000. Joe and Sam have agreed to swap properties. Joe will assume Sam's $600,000 mortgage on the apartment complex. How much is Joe's substituted basis in the apartment building