Ending single family zoning in Minneapolis resulted in something to the tune of 100 permitted duplex projects.
https://www.washingtonpost.com/business/what-happened-when-m...
> Minneapolis had 425,336 residents as of mid-2021, the Census Bureau estimates, and 199,143 housing units as of April 2020. By my count the end of single-family zoning has so far allowed for the permitting of at most 97 new units (the above table shows numbers of buildings, not units), some of which haven’t been built yet. If things continue at this pace, ending single-family zoning will have increased the city’s housing supply by just 1% by 2040.