To change a residential lot to commercial:NOTA BENE: You must not have Sims on this lot!! They will be hidden from view in most cases and unplayable!!
[*]Start the game
[*]While in build/place-lots mode enter the Residential lot
[*]once you are in the lot press CTRL+ALT+C
[*]in the cheat/debug console type "ChangeLotZoning community" (no quotes)
[*]save and exit the lot
[*]re-enter the lot still in build/place-lots mode
[*]press CTRL+ALT+C
[*]in the cheat/debug console type "moveObjects on" (no quotes)
[*]delete the mailbox and trash can
[*]open the objects and locate the pay phone and place it between the street and the sidewalk.
[*]locate the community trash can and place it with one free grid between the pay phone and the community trash can.
[*]press CTRL+ALT+C
[*]in the cheat/debug console type "moveObjects off" (no quotes)
[*]save the lot and exit to the neighbourhood view
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that's all