“Cost,” as applied to a project or portion thereof financed under this title, embraces all or any part of the cost of construction and acquisition of all lands, structures, real or personal property, rights, rights-of-way, franchises, easements, and interests acquired or used for a project, the cost of demolishing or removing any buildings or structures on land so acquired, including the cost of acquiring any land to which the buildings or structures may be removed, the cost of all machinery and equipment, rolling stock, financing charges, interest prior to, during, and for a period after completion of construction as determined by the commission, provisions for working capital, reserves for principal and interest, and for extensions, enlargements, additions, replacements, renovations, and improvements, the cost of architectural, engineering, financial, and legal services, plans, specifications, estimates, and administrative expenses, and other expenses necessary or incident to determining the feasibility of constructing any project or incident to the construction or acquisition or financing of any project.