441 ft2
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If the area is a rectangle then the perimeter in feet is: 2.5+7+2.5+7 = 19 feet, since 84 inches is the same as 7 feet.
Assuming the measure is of floorspace of a rectangular room, the area of the room is 84 x 30 = 2520 square feet.
A 2-foot border around a 20 x 14 area makes the area 24 x 18 making the perimeter 84 feet.
If there's a two foot border around a 14 x 20 foot area, that makes it 18 x 24 feet, with a perimeter of 84 feet.
If you're asking about a square with side length 21, the perimeter is 4 x 21 = 84 and the area is 212 = 441.