Are these $63 million micro-unit apartments in the Tenderloin a new model for workforce housing?

Two micro-unit housing projects in San Francisco’s Tenderloin will soon to start construction, adding to the historic wave of new housing in the low-income neighborhood.

Developer Forge Land Co. and contractor Swinerton filed building permits valued at $33 million for the 98-unit 145 Leavenworth St. project and $30 million for the 136-unit 361 Turk St. project. Construction startup BuildZoom first identified the permits.

Construction is expected to start by end of year, said Alexander Zucker, development…