On October 1, Year 4, Donald Anderson exchanged an apartment building having an adjusted basis of $375,000 and subject to a mortgage of $100,000 for $25,000 cash and another apartment building with a fair market value of $550,000 and subject to a mortgage of $125,000. The property transfers were made subject to the outstanding mortgages. What amount of gain should Anderson recognize in his tax return for Year 4?