Get some basic information from them depending on what they are ready and comfortable sharing over the phone. Definitely email address to send list of required info to. Get some basic info over phone if they have that available and comfortable with it...such as Total Facility Sq. Ft, Property Sq. Ft, vacancy rate, what they pay for insurance, property tax, and utilities. If they have fencing, cameras, or automatic gate. Very important is to the Unix Mix so you can see what sizes they have and how much they are charging for each size. As Brielle mentioned, see if they've had other offers or a sale price in mind so you can get an idea of their expectations. Whatever they are comfortable sharing on the first call is great, else you have an email address to request more info.

Great connecting with you. Let's stay in touch. Got some valuable tips from you as I try to navigate my first facility.