d. T6 Sub-District (Urban Core). The T6 sub-district is designed for high-density and waterfront mixed uses . This sub-district is the most intense land use Downtown. e. SD Sub-District (Special District). The SD sub-district is a low-intensity, limited
Read it in the chapter →How this ordinance defines it
The operative definition is the local one. Codes routinely subdivide a category into tiers — “day care 2, family”, “group home 2” — and attach different permissions to each, so only Portsmouth’s own text settles what this covers.