In other cases, this was done to allow the opening of a room at the ground floor and therefore create some usable space.

The current museum has less than 2,500 feet of usable space.

In its finished stage, the building will have 30,000 square feet of usable space.

He said that project had added about 70 percent more usable space to the property.

The increase in square footage has added more than 20% of usable space to the school.

Building floors rarely have more than 3,000 square feet of usable space.

Each ship has approximately 200,000 square feet of usable space.

Moreover, usable space is lost because of the need to provide floor area for the turnaround.

As a result, 3.500 square feet of usable space was stretched into 8,200.

This also increased the usable space without increasing the plot size.