slightly outdated info by a couple of years... but the item points should be close to right. There is no rent any more... at least on Calypso.
right now, prices are at pretty much an all time low on a lot of things. If you want to buy in for long term, do it now before prices go back up.
Even though rent is gone, rent is part of the cost shop owners used to have, so some long time owners may be adding some of that in to the price they are wanting to sell at to recoup their long term losses from the last several years, etc.
The info above was more or less compiled by watching various threads on shops, auctions, etc. about 2 years ago. Average prices are definitely down now, but now that those wanting clds for long term are getting most of them, I suspect prices will start going back up on other estates as fewer clds are out there and folks look for other types of investments to make in game.
supply/demand +clds and new estates created by new planets caused prices to lower to where they are today. Since there is only a limited number of estates on any given planet, and MA artificially makes that number even smaller by doing crap like not selling the basement shops in many apartment buildings ever, despite indicating in a Q&A back a few years ago that they might do something like that, supply/demand will cause prices to rise again over time.... especially if/when MA finally adds the highly demanded 'shop directory' to the in game auction listing what's available in various shops, and possibly making instant buyout from the shops via auction possible.