DALLAS — Taconic Capital Advisors LP, an investment firm with offices in New York, London and Hong Kong, has acquired International Plaza I and II, a two-building office campus totaling 757,000 square feet in Dallas. Designed by HKS Inc., the Class A buildings were developed in 1999 and 2002, respectively, and until recently were leased to JPMorgan Chase and Fannie Mae. Both companies have relocated to Plano. Taconic will make capital upgrades to the campus, including new amenities. Other terms of sale were not released. The third building at International Plaza is under separate ownership and was not part of this transaction. Cushman & Wakefield will handle leasing and management of the property.