To find the building's elevation above ground, we can follow these steps:
- The basement is 15 feet below ground level. This means that the elevation of the basement is -15 feet.
- The total height of the building from the basement to the roof is 70 feet.
To find the elevation of the roof above ground level, we can add the total height of the building (70 feet) to the elevation of the basement (-15 feet):
\[ \text{Elevation of roof} = \text{Elevation of basement} + \text{Total height} \] \[ \text{Elevation of roof} = -15 \text{ feet} + 70 \text{ feet} = 55 \text{ feet} \]
Therefore, the building's elevation above ground is 55 feet.
The correct answer is 55 feet.
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