I know a lot of people believe that the man in the tan jacket could be the owner of lot 37, but like with the idea of Dana being behind all this, it just seems kind of… off.
(That’s not to say the headcannon’s wrong! I’m just saying it feels off to me.)
Personally, I think it’s the Erikas who own Cecil. I mean, why else would they send him a thank you card and a picture of him fighting the antiques (ep 62 - “Briny Depths”)? Any normal person owning him would have made him do something malicious or self-serving at some point. But the Erikas? They’re all about doing good things! And come on. There had to be some kind of divine intervention to make Dana mayor, even though she hadn’t been listed as a candidate, much less been in Night Vale for the past year.
I think the Erikas have some sort of plan for Dana—have had a plan for Dana for a long time—and they need someone (Cecil) to make sure that outside forces (Hiram McDaniels, The Faceless Old Woman, the City Council, etc.) don’t interfere with whatever they’ve got going on.
(Also, just want to add that Dana wasn’t even in town to buy Cecil at the auction. She was still out in the other desert world.)