Honestly, they all should be worth less now than a few years ago since Mindark removed the hallways leading the televators as a location you can put items in.... also with the prices shopkeeper pads going for due to a few individuals hagging them all, upping the prices, the apartements should be worth even less as it is stands right now.
Originally I think Calypso apartments were sold by Mindark for around 300 peds on auction....
Legends estimation is maybe about right for Calypso... on other planets those estimates are a bit on the low end as there are fewer apartments off of Calypso so it's supply/demand. Also you have to consider in the upgraded value as Mindarks upgrade offer is 2k per estate...
As for Foma, prices should be going up since Foma was moved out of lootable space a while ago and moved a lot closer to the space station, etc. That change makes it a bit of a safer place than it used to be, but the market pricing hasn't really caught up with that change yet.... add in the fact thta it no longer costs to fly down to Calypso from FOMA, etc. as mindark removed the enter planet atmosphere cost... etc.
(still have the cost to exit atmosphere since they haven't removed decay fee on thruster yet... maybe someday)