23-300 EXECUTIVE SESSION to determine positions relative to matters that may be subject to negotiations, develop a strategy for negotiations, and/or instruct negotiators, pursuant to C.R.S. § 24-6-402(4)(e), and to consider the purchase, acquisition, lease, transfer or sale of real, personal or other property, pursuant to C.R.S. § 24-6-402(4)(a), for which a topic cannot be disclosed without compromising the purpose of the executive session