Please show work in a logical manner, thanks!
1) Dr. Dulbit Drillum, partner in the dental firm of Drillum, Fillum, and Billum, exchanged an office building (market value = $1,538,000) for an apartment building (market value = $1,450,000). Dr. Drillum owes $800,000 on a note secured by a mortgage on his office building, which has an adjusted tax basis of $1,100,000. The building he will receive in the exchange is encumbered with a mortgage that has a balance of $700,000. Dr. Drillum incurs transaction costs of $60,000. Each party agrees to take title subject to the existing mortgage on the substitute building.
b. What is Dr. Drillum's realized gain on this exchange?