Conversation so far:
Is the Frontier a property?
the Frontier Hotel and Casino.
Where was the Frontier located?
Las Vegas.
How much did it cost to build the Frontier?
CANNOTANSWER.
Was the Golden Nugget a Casino?
the Golden Nugget Las Vegas, a landmark downtown casino and one of the oldest casinos in the city.
Are theses properties still standing?
CANNOTANSWER.
What are some other facts about these properties?
His company stake increased so that, in 1973, he became the majority shareholder, and the youngest casino owner in Las Vegas.

Question: Did he build anything else during this time period?
Self-contained rewrite: Did Steve Wynn build anything else besides Frontier and the Golden Nugget between 1967 and 1989??