Mrs$.$ Brown purchased a residential income$-$producing property during the first month of her current tax year for $$600,000.$ At the time of purchase, the improvement portion was $90$ percent of value. Mrs$.$ Brown expects to hold the property for $14$ full years. She expects to sell the property at the end of year $14$ for $$900,000$ and the loan balance will be $$235,000($payable at $$2,710$ per month including $6\mathrm{.}5$ percent annual interest$).$ Sales costs are estimated at $$70,000.$

What will be the amount of Mrs$.$ Brown$$s capital gain from appreciation at the end of year $14?$

Group of answer choices

$$230,000$

$$520,407$

$$545,000$

$$328,593$