Owners of a hangar condominium complex at the Colorado Springs Airport will start construction Tuesday on a $2.5 million expansion that will make room for up to 14 more privately operated non-airline aircraft or aviation-related businesses.The 21,000-square-foot expansion is scheduled to be completed by year's end and is the latest of several projects underway as a result of a series of tax breaks put in place at the airport last year, including three other hangar projects either underway or about to start construction."We haven't built more space since 2013 and have been sold out since 2010.Read more on Colorado Springs Gazette