That’s a good idea to automatically upzone to double the sqft and units of neighbors (and height too). The previous BoS president, Aaron Peskin, had the opposite idea: he proposed an ordinance that apartments should be capped at the 1× the average sqft of the neighbors within 300 ft (https://sfgov.legistar.com/LegislationDetail.aspx?ID=3781286...). Fortunately, that ordinance did not pass, but it gives you an idea of the nonsense that he promoted: scarcity in the name of affordability.