Is Zakat obligatory on the principal amount of money deposited in the housing cooperative, or on the income generated from renting out properties during the waiting period?

Zakat is not limited to trade goods; rather, it is obligatory on saved or invested money if it reaches the nisab, which is equivalent to 85 grams of gold or 595 grams of silver. Contributing to the purchase of a property for sale is considered a trade good, and Zakat is obligatory on its principal and profit by valuing it at the completion of the hawl (one lunar year). However, if the property is solely for rent, Zakat is only obligatory on its rental income. If the lease ends with ownership, Zakat is obligatory on the rent during the lease period, followed by Zakat on trade goods upon the sale of the property.