9 feet 10 inches

While the other towers that have set world records have been solid, I don't think I will ever have enough Legos to do that so instead I'm using a design that is more like the steel frame of a skyscraper. In this case the the design was simple. Each pillar is 20 2x2 blocks. Four pillars are attached to each "square" which is two layers of 2x4 blocks (five and a half blocks per edge of the square).

This takes up 40 2x4 blocks per square which is repeated 15 times. The pillars are repeated 14 times. This totaled 1120 2x2 blocks and 600 2x4 blocks for a total of 1720 bricks. The resulting tower is 118 inches tall (9 feet 10 inches).

The tower has 310 layers of bricks meaning that 2.63 layers per inch.

Overall I'm amazed at how tall and sturdy it is while not using that many bricks. Hope for taller towers remain.