Is Zakat obligatory on real estate that is not invested, or rented out for a meager amount, or empty, or used for the housing of sons, and is paying 2.5% of the commercial profits of a store sufficient for Zakat?

Zakat is obligatory on lands and houses prepared for trade, treated as Zakat on trade goods. It is also obligatory on rent if it reaches the نصاب (minimum threshold) and a hawl (one lunar year) passes over it. However, what is prepared for personal ownership and dwelling is not subject to Zakat. Zakat is obligatory on a commercial store if the value of what is prepared for sale therein reaches the نصاب and a hawl passes over it. The obligatory Zakat amount is one-quarter of one-tenth (2.5%).