Note:
(a) Twin Oaks (Washington, DC)
en.wikipedia.org/wiki/Twin_Oaks_(Washington,_D.C.)
(The historic residence [building is more appropriate, for nobody lives there any more], completed in 1888; [Taiwan] uses it for official receptions)
(b) 雙橡園
zh.wikipedia.org/wiki/雙橡園
(2011年起恢復在雙橡園舉行雙十國慶酒會)
There is no need to read the rest of either Wikipedia.