Mar-a-Lago's next-door neighbors sent letter to town of Palm Beach, Florida
Letter by DeMoss family's lawyer demands Trump not be allowed to move there
Trump changed his legal residence last year from New York City to Palm Beach
But in 1993 he signed 'use agreement' pledging not to live at Mar-a-Lago
'Use agreement' signed after Trump turned Mar-a-Lago from mansion into club
Trump has clashed with Palm Beach lawmakers in past about zoning issues
Last year, Palm Beach refused Trump's request to build a dock at Mar-a-Lago
Trump has sued Palm Beach over noise of airplanes landing at nearby airport
In 1985, Trump, a real estate developer, paid $7million for Mar-a-Lago