$1.$ What is the Before Tax Sale Proceeds from the sale of the Property in Year $5?$

$2.$ What is the Adjusted Basis for the sale of the Property in Year $5?$

$3.$ What is the Gain or $($Loss$)$ for the sale of the Property in Year $5?$

$4.$ What is the Tax Expense for the sale of the Property in Year $5?$

$5.$ What is the After Tax Cash Flow from the sale of the Property in Year $5?$

$6.$ You are considering buying a commercial building that has $5$ floors and a basement, with all floors having the following dimensions, and a common area of $2,500$ square feet. What is the Gross Building Area $($GBA$)$ and Useable Square Footage $($USF$)?$ If each floor is a rental unit that is allocated $16\mathrm{.}67\%$ of the common area, what is the Rentable Square Feet $($RSF$)$ for each floor?