The "rental office" is a business office at your apartment building? I would think that was the "secure location" if it's not your doorstep/mailbox. I live in an apartment with doors that are outside and face the street. If something doesn't fit in the mailbox then USPS somehow has access to a locked door that goes to a room just outside our laundry room. They leave people's packages on the desk there. But it's not some weird mystery location that they picked at random, everyone in the building knows to look there.