TRESPASSING IN MISSOURI
A person can be charged with Missouri trespassing in the first or second degree, both of which are misdemeanor crimes.
Trespassing in The First Degree
Being charged with trespassing in the first degree in Missouri means that a person or persons have committed any of the following offenses:
Enter a property that is clearly marked with purple paint, as described in the Missouri Statute.
Enters into a property with “ No Trespassing” signs posted.
Enters into a property that is fenced.
Knowingly, unlawfully enters a property or refuses to leave after being told to.
The charge in Missouri for trespassing in the first degree is a Class B Misdemeanor with up to six months in county jail and up to a $500 fine.
https://www.missourilegal.com/practice-areas/criminal/trespassing-in-missouri/
This is posted all over their community
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The gates are marked with "No Trespassing" and "Private Street"
https://www.foxbusiness.com/real-estate/portland-place-st-louis-mccloskey-gated