(a) Unit owners may make any improvements or alterations to their unit that do not impair the structural integrity or mechanical systems of the condominium or lessen the support of any portion of the condominium.
(b) After acquiring an adjoining unit or an adjoining part of an adjoining unit, unit owners must submit a written request to the board of directors for permission to remove or alter any intervening partition or to create apertures therein, even if the partition in whole or in part is a common element. The board of directors shall require unit owners, at their expense, to submit a written opinion of an architect or professional engineer, registered in the State of Oregon, that the proposed change will not impair the structural integrity or mechanical systems of the condominium or lessen the support of any portion of the condominium. The board of directors shall approve the change within forty five (45) days, unless it determines that the proposed change will impair the structural integrity or mechanical systems of the condominium or lessen the support of any portion of the condominium. Removal of partitions or creation of apertures under this paragraph is not an alteration of boundaries.
(c) Unit owners shall make no repair or alteration or perform any other work on their unit which would jeopardize the soundness or safety of the property, reduce its value, impair any easement or hereditament, or increase the common expenses of the Association unless the consent of all the other unit owners affected is first obtained.
(d) Unit owners may not change the appearance of the common elements or the exterior appearance of a unit without permission of the board of directors.