You are going to go to IT Square Laksi Plaza temporary office, just next to Lak Si station of SRT Dark Red Line.
You will go here.
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a) -> They accept walk-ins, no problem. Just go there.
c) -> A tourism extension is 30 days, only once.
b) & d) -> All other information/tips are in this general information sheet. You need to glue a photo on the form.
There are copy shops around the immigration office on 3rd fl.