Description
Subtract lowerFacadeOffset from upperFacadeOffset for stepback.
Urban-design quantities depend on the measured boundary and denominator. Building height, parcel area, street width, and setbacks describe different geometric constraints and should use a common length or area basis.
Subtract lowerFacadeOffset from upperFacadeOffset for stepback.
When to use this tool
Use Parcel Streetwall Stepback Offset when you need one planning geometry component from supplied dimensions before a wider design review.
How to use the tool and how it works
- Enter lowerFacadeOffset, upperFacadeOffset. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read stepback. Use the output convention below.
Subtract lowerFacadeOffset from upperFacadeOffset for stepback.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| lowerFacadeOffset | Lower Facade Offset | Required. Finite number. |
| upperFacadeOffset | Upper Facade Offset | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| stepback | Stepback | Required. Finite number. |
{
"input": {
"lowerFacadeOffset": 2,
"upperFacadeOffset": 5
},
"output": {
"stepback": 3
}
}Limitations and assumptions
- Offsets must share origin, direction, and unit; a negative stepback is allowed and no zoning rule or building envelope is validated.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Check the applicable survey, planning rules, and professional design assessment before using the result in a project.
References
Similar or alternative tools
- Parcel Frontage Setback Depth
Subtract frontSetback and rearSetback from parcelDepth for buildableDepth.
- Zoning Height Reference Offset
Subtract referenceElevation from topElevation for heightAboveReference.