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Wall thickness depends on printing process. You can get away with thinner walls with FDM for instance. I like to use 1mm as a standard throughout the model giving it a more uniform look. Architectural models are frequently printed using CJP, but other technology can be used.
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Are you referring to the individual parts of the building or multiple buildings? If you have a single building then you should turn off any layers you do not wish to be printed then save the stl. With multiple buildings it is best to print them separately to all the provider to pack them efficiently…