Developer Mack Urban submitted plans for a 43-story, 430-unit residential tower at 1001 John St. in South Lake Union, proposing to include an open-air hill climb similar to the one at downtown’s Harbor Steps.

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Developer Mack Urban submitted plans to the city Wednesday for a 43-story, 430-unit residential tower at 1001 John St. in South Lake Union, proposing to include an open-air hill climb similar to the one at downtown’s Harbor Steps.

Both the hill climb and an elevator would provide pedestrian connections to navigate the steep drop from Boren Avenue North to Terry Avenue North, according to the developer. John Street dead-ends on both sides of the block.

The planned tower would be adjacent to a building whose tenants include The Seattle Times. H5 Capital also recently proposed two 42-story buildings on the block.

Under city zoning rules, only two of those three proposed towers can actually be built.

Mack Urban bought the site in December 2014 for $11.5 million, or approximately $623 per square foot, according to a spokeswoman.