Abby's home had a basis of $360,000 ($160,000 attributable to the land) and a fair market value of $340,000 ($155,000 attributable to the land) when she converted 70% of it to business use by opening a bed-and-breakfast. Four years after the conversion, Abby sells the home for $500,000 ($165,000 attributable to the land).

Calculate Abby's basis for gain, loss, and cost recovery for the portion of her personal residence that was converted to business use.