When an office runs from one room of a residential apartment, is its entrance counted in the home's grid or is the office gridded separately?
It depends on the map. If the office has its own separate door, grid it separately, since its work and its door are separate, and grid the home separately too.
Related questions
Can an office be built in a basement?
An office needs ventilation, so a basement does not suit proper work. Only businesses of an adharmic nature, such as some salons and facial parlours, run well in basements; they do not need pure energy like the Sun's.
Does everything taught today also apply to an apartment or flat, or only to a kothi?
Everything taught today applies to flats as well, except bhoomi vibhajan. In a flat it is already done: the space left around the building during construction is its Pishach bhoomi. Ati marma, zoning and directions all apply inside the flat.
How is zoning done for a flat?
Exactly as for any plot; flats, industries and every other building follow the same method. Finding the centre of a flat can be hard, so use AutoCAD or the paper method for irregular shapes. Only a temple differs, because it uses the 64 pad grid, where North falls between N4 and N5.
If Pishach bhoomi is not considered in a flat, why draw it at all?
Bhoomi vibhajan is not drawn for a flat, and a flat has no Pishach bhoomi dosh, because the building already has open space left on all sides. So whatever you keep inside the flat does not create that dosh.
If bhoomi vibhajan is not done in a flat, is devta marking still done, given that the 32 devtas lie in the Pishach bhoomi?
Yes. Devta marking is done in a flat exactly as usual, also to judge the main door location. What does not apply is the rule of leaving the Pishach bhoomi empty: inside a flat the corners and side spaces can be used.
Some devtas sit in the outer paishachik ring and some inside. Which devtas do we treat inside the house?
Your own house also has a paishachik ring. In a flat, the band along the walls on all four sides (about 1 foot in the example discussed) is its paishachik bhoomi, so mark it with the measurement taught in the previous class and treat the devtas there.