C.R.S. § 38-33.3-309

(1) Unless the bylaws provide otherwise, a quorum is deemed present throughout any meeting of the association if persons entitled to cast twenty percent, or, in the case of an association with over one thousand unit owners, ten percent, of the votes which may be cast for election of the executive board are present, in person or by proxy at the beginning of the meeting. (2) Unless the bylaws specify a larger percentage, a quorum is deemed present throughout any meeting of the executive board if persons entitled to cast fifty percent of the votes on that board are present at the beginning of the meeting or grant their proxy, as provided in section 7-128-205 (4), C.R.S.