Residential and shoreland zoning overlay districts. This subsection applies only to residential districts and shoreland zoning overlay districts. The CEO will notify abutting landowners by mail that a building permit has been issued whenever a building permit will lead to the construction of a new dwelling unit, will lead to the creation or expansion of a commercial use, or will lead to the creation or expansion of an accessory use with commercial aspects. In addition, in the Shoreland Zoning Overlay Districts, the notice will be issued for any exterior change requiring a building permit. These notices are not required if earlier approvals required for such a permit have been the subject of a public hearing, such as those held for conditional use, site plan review, subdivision, shoreland zoning, a variance, or other similar permitting actions. The notice will be mailed within one week of the issuance of the building permit, and shall describe briefly what the permit is for, and describe briefly the appeals process. Failure to receive the notice shall not invalidate any action taken by the CEO.