@Neville
@Joseph
There are 8 countries who have designated their Missions to the United Nations in NYC to also serve as their Embassy to the USA.
This is not an unusual situation, as some countries will designate an Ambassador to serve as representative to more than one country. Israel, for example maintains only 69 embassies while having diplomatic recognition from more than 150 countries. In Latin America and the Caribbean the Israeli Ambassador may serve multiple countries from one embassy and have use of a consular or other office when visiting them