A controversial proposal by Ald. Sophia King (4) to tighten regulations around house-based museums and cultural sites is set to meet its fate on Tuesday as King steps up her defense against critics — who on Monday included Mayor Lori Lightfoot.

The ordinance (O2020-6185), as introduced by King last December, would have banned property owners from opening “libraries or cultural exhibits” in most residential zoning districts. She softened her proposal ahead of last month’s meeting of the council’s Committee on Zoning, Landmarks and Building Standards by limiting the ban to single-family residential districts, while applicants would need permission from the city’s Zoning Board of Appeals to open the so-called “home museums” in multi-unit zoning districts.