不動産
ふどうさん · fudousan · JLPT N1 · noun
real property
🏠 not + move + property = immovable property = real estate
動産 (dōsan) means movable property, like cars or furniture. Adding 不 (not) flips it: 不動産 is property that cannot be moved, i.e. land and buildings.
不 — single pictograph; bird flying upward
Originally a pictograph in oracle bone script, traditionally interpreted as a bird flying up toward the sky and unable to come down, suggesting negation or refusal. Over time it became the standard negation word in Chinese, used before verbs and adjectives to mean 'not'.