Hello, greytraveller.
The way you analyse your dream while having it and also the lucidity indicate that the 6th chakra is active. The 6th chakra plays a big role in integrating the abilities of an energy body and being capable of logical analysis. It's usually also the stepping stone into lucidity. (All according to Kurt.)
Being aware that you were in a "multi-story building" was probably inner sense awareness of your location regarding to the wider astral plane. You know you were at a certain level, and it indicated it might have been possible to switch between subplanes in this experience.
If this was really an astral plane dream, you were at no time "close to your physical body." You kind of tricked yourself here into believing you have to exit when you're already "out" and being drawn in by what was not your physical body to begin with. I think the rule only applies to etheric body RTZ OBEs within your bedroom. I also think that at the time you being to dream lucidly etheric OBEs recede a lot, at least for some people. They're not "gone," there might just be less of them.
Identifying that a dream character is just an expression of elemental essence and has no independent existence outside the dream environment you're in is a function of the 4th chakra, possibly here combined and coordinated with the 6th. A feeling (a notion of "this is a dream character") combined with analysis thereof.
To expand lucidity you could try challenging dream characters. Instead of telling them something, ask them something. Ask the surrounding dream. Put a question to the room. This might all expand a lucid dream either into an astral plane OBE or yield very interesting answers.
Cheers,
Oliver
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