1.   Companies such as Winstar and Teligent have developed a multimillion-dollar market in several cities for connecting office towers through rooftop radio dishes.

2.   Its slender columns could never stand up to architectural reality and the bridges connecting the towers defy gravity, he said.

3.   The tower is connected to the hotel by skywalk.

4.   The towers are connected by a notorious maze of halls housing fast-food restaurants and shops.

5.   Kennedy and several co-workers made their way down emergency staircases to the darkened concourse that connects the towers at ground level.