Workers install an ATCO Structures modular apartment unit for Attainable Homes Calgary’s new six-storey modular apartment building in downtown Calgary on July 29. Each of the approximately 40,000-pound units are lifted into position by a large crane over about a week. Photo by Gavin Young/Postmedia

The latest apartment building to hit downtown Calgary’s skyline was not built from the ground up — but on an assembly line.

Built by ATCO Ltd. through a partnership with a City of Calgary affordable housing subsidiary, the six-storey building will have 84 studio units.

In the next several days, crews will stack dozens of “modules” — massive building blocks — forming an apartment building that will charge below-market rents.

This kind of modular housing — built in a factory and later assemb

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