I saw an article from New York voting Records archives.
You look it up that is 36 years. Don’t confuse contributing to Dems with being one.
I remember when Ed Koch was Mayor he had a hard time getting that Democrat mayor to let him build the Wallman skating rink for nothing because he wasn’t a Dem and Koch didn’t want a Republican getting credit for doing something that had been a boondoggle for almost a decade.
Even back then people thought Trump was planning to run for president on the Republican Ticket.
I can assure you that party affiliation had nothing to do with that story. He wouldn't have let Jon Corzine or some other Democratic hack at Goldman Sachs do it, either. Koch didn't want Trump to build the skating rink for the same reason he despised the Guardian Angels -- because they were colossal embarrassments to New York City, and scathing reminders of just how ineffective the city government was at the time.