Setbacks and Building Ties
Setbacks are distances from subject property and adjoining property building structure(s) to the front/street/side (and sometimes rear) property lines, measured at right angles from these property lines. They provide municipal zoning by-law compliance information, as well as assist land surveyors in the future re-establishment of the same boundary lines. Additional plan notations may clarify where building setbacks were measured, such as "Building ites taken to concrete walls unless otherwise noted.
To re-establish property lines by using buildings as long-lasting unmovable witnesses of property line locations.
Why is this important?
This provides key measurements of the property. Use setback distances to determine where your property line/boundary is, assuming the structure has not changed since the date of the survey. Take the distance from the plan and measure it out on the ground at the point marked on the plan.