Well if you really draw it out he got more experience
Citing NY Post here:
The answer is that Trump’s entire life has been marinated in politics. His father, Fred Trump, made millions building apartments in Brooklyn and Queens. It didn’t hurt, when it came to land assembly and public subsidies, that he was a key supporter of Brooklyn machine Democrats and a close friend and ally of Abraham Beame, city comptroller in 1964 and later mayor.
A decade later, Donald Trump, at 28, basically took over the family business and focused it elsewhere. New York City, plagued by violent crime and high taxes, lost 1 million people in the 1970s. Building apartments in the outer boroughs was looking like a sucker’s game. Getting a toehold in Manhattan at the market’s trough, to profit when it glittered again, looked like — and was — a winner.
It helped that Beame was elected mayor in 1973 and that Hugh Carey, for whom the Trump family provided major financial backing when he was an underdog in the primary, was elected governor in 1974.