Big-time apartment developer Equity Residential and Seattle developer Touchstone have filed a preliminary application with Seattle city planners for another apartment complex in South Lake Union.

Big-time apartment developer Equity Residential and Seattle developer Touchstone have filed a preliminary application with city planners for another apartment complex in South Lake Union.

This one — seven stories, 223 units — would be on the west half of the block bounded by Fairview Avenue North, Minor Avenue North and John and Thomas streets, property that for years was the low-rise headquarters of Cascade Natural Gas.

Cascade relocated and sold the site, as well as most of the east half of the block, to Touchstone in 2010. Touchstone later sold the east half to Chicago-based Equity, which has proposed a five-story, 275-unit apartment complex there.

Residential development isn’t allowed on the west half now, but city officials are expected to approve a neighborhood-wide rezone that permits it.

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Planners are considering alternatives that would allow residential buildings from 160 to 300 feet tall on the site, much taller than Touchstone and Equity propose.

Their plan calls for 11,600 square feet of ground-floor retail and parking for 207 vehicles.

About 900 apartments are under construction, and hundreds more are planned in South Lake Union, home of Amazon.com‘s 1.7 million-square-foot headquarters complex.

The city’s advisory West Design Review Board is tentatively scheduled to consider the Equity/Touchstone proposal Aug. 15.

Eric Pryne: 206-464-2231