Zoning designation

What Is O-1 Zoning? Office Districts Explained

What O-1 zoning usually allows, the size, height, and buffer rules that make it a transition district, how San Antonio, Oklahoma City, Orlando, and Lincoln define it, and what you can build on office-zoned land.

By Nathan Robinson, Founder, Plotzy Published 5 min read

O-1 is the office district in codes that give offices their own letter, and usually the lightest of two or three office tiers. Cities map it as a transition: between a commercial corridor and the houses behind it, along a busy street where retail would be too intense, or around a hospital. It allows professional and medical offices in small buildings and keeps out most retail, so it generates daytime traffic and little else. Many codes do not have an O district at all and fold offices into their commercial districts.

What O-1 usually allows

  • Professional and business offices: law, accounting, insurance, real estate, design, and similar.
  • Medical and dental offices and outpatient clinics.
  • Banks and financial offices, often without drive-through lanes.
  • Day care, schools, places of worship, and civic uses.
  • Residential uses in some codes, from single-family homes to apartments.
  • Limited support retail or services, such as a pharmacy or cafe inside an office building, in some codes.

Commonly prohibited: general retail, restaurants as a primary use, fuel and vehicle uses, drive-throughs, hotels, self-storage, and anything industrial.

What the code usually requires

  • Building size caps or floor area ratios that keep buildings small.
  • Height: commonly two to three stories, in keeping with adjoining houses.
  • Setbacks and landscaped buffers next to residential lots.
  • Parking ratios for office and medical uses, with medical requiring more.
  • Sign and lighting limits stricter than in commercial districts.
  • Residential-style design in some cities, such as pitched roofs or parking behind the building.

How real cities define O-1

  • San Antonio: O-1 is the lightest of three office districts (O-1, O-1.5, and O-2). It restricts uses primarily to offices and ancillary uses, as a buffer between residential areas and more intensive uses, in low to mid-rise buildings.
  • Oklahoma City: O-1 is the Limited Office District, intended for administrative and professional offices in smaller structures in a landscaped setting, as a buffer between more intense commercial uses and established residential neighborhoods. O-2 is the General Office District.
  • Orlando: O-1 is the lowest of three Office and Residential Districts (O-1, O-2, and O-3), meant for offices or a mixture of offices and housing. O-1 is intended for offices of a scale and design compatible with surrounding residential neighborhoods.
  • Lincoln, Nebraska: O-1 is the Office District, an office area near the County-City Building and the State Capitol that also provides for dwellings. O-2 (Suburban Office) and O-3 (Office Park) cover other areas.
  • Phoenix uses C-O (Commercial Office). See our Phoenix zoning guide.
  • Austin uses NO, LO, and GO (neighborhood, limited, and general office). See our Austin zoning guide.
  • Columbus, Ohio handles offices through its C-2 Office Commercial District.

What you can typically build

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Small professional and medical office buildings, clinics, bank branches, and, where the code allows residential, houses, townhouses, or apartments. Converted houses used as offices are common in O-1 areas along older streets. Retail and restaurant users generally need a neighborhood commercial district such as C-1 or B-1, and projects that combine offices, retail, and housing usually need a mixed-use district.

How to check a specific parcel

Confirm the district on the official zoning map, then read the O-1 use table for your exact use, since medical offices, clinics, and banks are sometimes treated differently from general offices. Check the building size cap, the height limit, and the buffer required next to residential lots. Our guide on checking permitted use walks through the steps. In Plotzy, filter an area to O-1 and equivalent designations by lot size, and ask Zoning AI "Is a medical clinic permitted in O-1 here, and what is the maximum building size?" for an answer with the section cited.

Frequently asked questions

What does O-1 zoning mean?

O-1 is typically the low-intensity office district, allowing professional, business, and medical offices in small buildings, often as a buffer between commercial areas and residential neighborhoods. Official names vary: Office District in San Antonio and Lincoln, Limited Office in Oklahoma City, Office and Residential District in Orlando.

Can I open a retail store or restaurant in O-1?

Usually not as a primary use. Some codes allow limited retail or food service that supports the offices, with size caps. General retail and restaurants need a commercial district.

Can I build apartments or a house in O-1?

In some cities, yes. Orlando's O-1 is an Office and Residential District, and Lincoln's O-1 provides for dwellings. Other codes limit O-1 to offices and institutional uses, so check the use list.

What is the difference between O-1 and O-2?

O-2 generally allows larger and taller office buildings and a wider range of uses. In Oklahoma City, O-1 is Limited Office and O-2 is General Office. San Antonio has three tiers: O-1, O-1.5, and O-2.

Sources

District names and standards on this page were checked against each jurisdiction's own code or planning documents on October 4, 2026. Codes are amended often, so confirm the current text before relying on any detail.

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