For what purpose are you trying to get on a studio lot? I ask because it's the first question someone will ask when you make the request of them. Security has changed considerably in the last decade.
If you want a set visit, you need to find someone who is working on the set or someone who knows someone who is working on a set.
If you want a pitch meeting, those are harder to get. It doesn't sound like you're represented or you wouldn't be asking me about this. Do you know someone who believes in your project pitch enough to get you in the door?
These are the most simplified answers I can give you in a blog with the little information you gave me.
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