Trump Plaza. Trump Place. Trump Park Avenue. Trump World Tower. Trump International Hotel and Tower. They all have another name in common:

Costas Kondylis.

Mr. Kondylis was the architect of choice for Donald J. Trump and other developers of luxury apartment towers in New York for three decades. He died on Aug. 17 at his home in Manhattan at 78.

The cause was complications of Parkinson’s disease, his daughter Alexia Leuschen said.

“My concern is to create value for the developer, because they’re my clients,” Mr. Kondylis told The New York Times in 2007.

Mr. Kondylis (pronounced kon-DEE-lis) was a senior partner at Philip Birnbaum & Associates from 1979 to 1989, when he founded Costas Kondylis & Associates. That practice, renamed Costas Kondylis & Partners in 2001, dissolved in 2009.

“Costas was an incredible friend to our family and a remarkable architect,” Donald Trump Jr. and Eric Trump of the Trump Organization said in a joint statement on Thursday. “He leaves behind an amazing legacy.”