You'd probably need to understand a bit more about the basics of these large property ownership and management to kind of get what all is at play here. I'm more versed in commercial property management, but large scale apartment residential isn't often far off.
So you'll have some group of investors which pool together a bunch of money (like REITs, not always) and buy a building (normally the people who build these things don't hold on to them very long, lots of specialization). This organization is the "ownership".
The ownership usually doesn't know/doesn't want to deal with the day to day management of the property, they're just the financials kind of people. They hire a management company. The management company works with the ownership to understand budgets for the building, expected revenues, etc. Management deals with all the contractors to make the building operate.
Often, the management company then hires a leasing company, or might have a leasing arm of the company. This is then the sales side of the whole business of the building. These people are then in charge of finding tenants and be a bit of the outward customer facing side of the operation. These are the people you'd talk to when you're wanting to negotiate on pricing. However, they don't directly control the prices. Remember, ownership wants to ensure certain revenues for the building, and management is in charge of hitting budgets. So that front line agent just making up numbers all willy-nilly can have a lot of effects on not just that leasing company, but the management company that contracted them, and the ownership company that contracted the management company. That person you're talking to about the lease might be a contractor of a contractor of the ownership of the building, and ultimately it's the ownership's money on the line.
All of these groups are often different organizations and companies, and this structure is just one example out of many. As mentioned, sometimes management teams have their own leasing arms. Sometimes ownerships have preferred leasing partners and will push management to use some other leasing company. So its not always a single "this person always reports to that person" kind of structure, so that's why its pretty vague in these filings.