Prime US 41 Frontage Property in North Port. OPI Zoned Commercial Land Available on US 41 in Warm Mineral Springs, North Port. Warm Mineral Springs is known for its healing waters. The adjacent lot in back of it, MLS# C7430068, is also for sale by the same owner. It is also zoned OPI. Together these make 29,822 sq ft of OPI zoned property with US 41 frontage. OPI Zoning (Office, Professional, Institutional) is a highly desirable zoning classification with many valuable entitlements. A list of OPI entitlements is attached.