How do I get out of a two-year lease I just signed a couple of weeks ago for a retail space? They said they provided security. Only there 12a-5p.

When I was looking at the retail location, I asked about the homeless situation, and they said they have security. After I signed the contract, I then found out they only provide a drive-by security detail twice a night between midnight and 5a. I have homeless people standing in front of my business during regular business hours. I sell upscale custom cakes, and my customers won't approach my business if I have homeless standing outside. I also teach CPR classes in there a few times a week, and they stand in front of my window while I'm teaching as well. I *highly* doubt they will get full-time security, and I want out of the contract immediately.