I couldn't find one already in the forum, so here is the beginning of a collection of basic information about shops. I will elaborate as I remember more. Feel free to suggest additions/points I have missed.
As an alternative to the Auction House, there are several hundred player-owned shops on Calypso and F.O.M.A. Items can sometimes be found in them for less than the going MU. Shops can be found in three different types of location on Calypso: Malls, Cities, and Marketplaces. There is one shop location on F.O.M.A.
Malls
Note: the numbering, while odd, is correct. There are no shops 6 or 9.

(credit for image: SZ)
[medusa floor plan - need to draw]
Cities
Each tower has the capacity for 18 shops, with six shops on each wall. Many of these shops have never been implemented by MA, leaving the majority empty. Some towers also have booths located in one or more of the three entrance areas.
Booths are identified by booth number, and shops are identified by tower name, block value (A, B, or C), and shop number (1-6). In each block, shops are numbered from left to right, except for Sakura City Yuujou Tower block A, and Genesis Tower D block B, which are numbered right to left.

Marketplaces
[layouts - need to draw]
Shopkeepers
Shopkeepers are in-game items like miniature shops that can be placed in an estate you own. These include apartments, land area sheds, houses, shops, hangars, and castles. SKs require 6(?) item points, so be sure to allow for that when deciding on an estate. They decay 10 PEC per sale, and once they reach minimum value, players may view what they contain but cannot buy from them. [SKs in apartment have tax?]
A basic guide to estate buying/owning can be found in this thread. A few things are outdated, such as prices, references to rent, and hangar info, but in general the basics remain the same. The OP also includes a good picture of apartment layouts. [possibly include here]
Apartments
Apartments are located in the towers in the cities listed above. The number of shopkeepers that can be placed in each one depends on the number of item points an apartment has.
Land Area Sheds
These are found on land areas on Amathera. The shed deed is separate from the actual land area deed, and they are often not owned by the same player. [look up item points - all the same?]
Houses
Houses are small estates that can be found in small clusters in various locations, usually some distance from TPs, cities, or other populated locations.[item points same? across all locations?]
Echidna
Corinth
Nymphtown
Hadesheim
Hangars
Castles
Castles are similar to houses, but on a larger scale.
TI
Morningtear
Chateau Liberte
[To be elaborated further]
As an alternative to the Auction House, there are several hundred player-owned shops on Calypso and F.O.M.A. Items can sometimes be found in them for less than the going MU. Shops can be found in three different types of location on Calypso: Malls, Cities, and Marketplaces. There is one shop location on F.O.M.A.
Malls
- Deer Mall
- Emerald Lakes
- Medusa
- Port Atlantis
- Twin Peaks
Note: the numbering, while odd, is correct. There are no shops 6 or 9.

(credit for image: SZ)
[medusa floor plan - need to draw]
Cities
- Genesis Amethera Headquarters
- Omegaton Habitat West
- Sakura City
- Treasure Island City
Each tower has the capacity for 18 shops, with six shops on each wall. Many of these shops have never been implemented by MA, leaving the majority empty. Some towers also have booths located in one or more of the three entrance areas.
Booths are identified by booth number, and shops are identified by tower name, block value (A, B, or C), and shop number (1-6). In each block, shops are numbered from left to right, except for Sakura City Yuujou Tower block A, and Genesis Tower D block B, which are numbered right to left.

Marketplaces
- Cape Corinth
- Chateau Liberte
[layouts - need to draw]
Shopkeepers
Shopkeepers are in-game items like miniature shops that can be placed in an estate you own. These include apartments, land area sheds, houses, shops, hangars, and castles. SKs require 6(?) item points, so be sure to allow for that when deciding on an estate. They decay 10 PEC per sale, and once they reach minimum value, players may view what they contain but cannot buy from them. [SKs in apartment have tax?]
A basic guide to estate buying/owning can be found in this thread. A few things are outdated, such as prices, references to rent, and hangar info, but in general the basics remain the same. The OP also includes a good picture of apartment layouts. [possibly include here]
Apartments
Apartments are located in the towers in the cities listed above. The number of shopkeepers that can be placed in each one depends on the number of item points an apartment has.
Land Area Sheds
These are found on land areas on Amathera. The shed deed is separate from the actual land area deed, and they are often not owned by the same player. [look up item points - all the same?]
Houses
Houses are small estates that can be found in small clusters in various locations, usually some distance from TPs, cities, or other populated locations.[item points same? across all locations?]
Echidna
Corinth
Nymphtown
Hadesheim
Hangars
Castles
Castles are similar to houses, but on a larger scale.
TI
Morningtear
Chateau Liberte
[To be elaborated further]
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