Unless you're in Syria, your fears are overblown.
Has anybody from your program assigned to that site been the victim of a crime?
You sound like someone who is unfamiliar with big cities. Most crime victims are caught up in the life, buying or selling drugs, or know someone who is. If you don't look scared or scary, they'll leave you alone. Just walk purposefully to your destination. Be confident. If someone hassles you, ignore them. Usually you're getting hassles as a goof on you, because they know you're scared of them.
Don't leave anything visible in your car.
I worked as a PCA at a hospital in a bad neighborhood and had clinicals there.
First, the hospital security and cops were all over the place. Second, when street people or bangers saw scrubs, they left us alone. They know we do for them, and they know we are some of the only people who help them and treat them like human beings.
If you're really scared pay for parking.