Should the indoor storey height of commercial housing be lower or higher than that of outdoor? Is there any feng shui?

Generally, the indoor ground is higher than the outdoor ground, and geomantic omen is also the knowledge of living environment, that is, living comfortably and appropriately. The first year of indoor high school is to prevent rainwater from flowing back indoors when it rains, and the second year is. A little higher and drier indoors, with less humidity, is good for human joints. 3. A little higher indoors is good for homeowners, so they can work with peace of mind and get rid of the mud.