A boundary realignment is an adjustment of the title boundaries that does not increase the number of existing lots.
In many cases a boundary realignment is carried out to resolve encroachment issues between adjoining owners. The boundary in question can be realigned to ensure that the encroachment is contained wholly within the lot that the structure is erected on.
You may have property that is comprised of two or more titles where a house straddles the common boundary. A realignment can move the boundary from its current location closer to the side boundary to create a road frontage lot and a rear access lot.
Another example is if two adjoining owners wish to realign a common boundary for the purposes of increasing or decreasing their title area. Land is then purchased/transferred between the two owners.