A mum in the United States has been left in shock after residents from her building in Florida sent her a threatening letter regarding her 16-year-old daughter who has autism.

The note claims that the residents of The Plaza of Bal Harbour "will not compromise their quality of life any longer" and ordered her to move out — or else.

The appalling note was left for Leah Solomon and claims her daughter has "major issues" and that they have sought legal counsel against her.

This week a despicable incident occurred at The Plaza at Bal Harbour. A family, who has a beautiful 16 year old child...

Posted by Gabriel Groisman, Mayor of Bal Harbour on Friday, 20 April 2018

"Her lack of impulse control, her screaming outbursts are not acceptable to the residents of this building," the letter reads.

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"The choice is yours. Either move out of the building on your own, or the residents of this building will take action and you will be forced to move."

The note goes on to say that the "right thing to do would be to take your daughter to a facility that can accommodate disabled people … where you would not be infringing upon the quality of life of others."

Leah shared the letter on Facebook, with the Mayor of Bal Harbour, Gabriel Groisman, quick to condemn the letter, saying that the police have been notified.