this has been a rumor for a while.
GGLO is proposing an apartment building with ground floor retail space, five levels of parking, and 36 to 39 total floors, with an estimated height about 420 feet making it a new tallest. location is on Front Street between 10th and 11th, just south of the currently-under-construction 15-floor dual brand hotel.
image of the property from Boisedev:
though still in the early stages, according to the story GGLO is far enough along to start working with the city on planning and zoning.
story on Boisedev.com:
https://boisedev.com/news/2025/03/11/11th-front-boise-apts/