What is the ruling on Zakat for a share in land that was purchased with the intention of investment, then the intention changed to residence, then to rental, and then it was sold?

The commodity prepared for trade becomes for personal use by the intention of possessing it. This is because the continuation of the intention for trade throughout the year is a condition for the obligation of zakat. So, if you intended to convert your share, which was prepared for trade, into a residence, it has then become for personal use. Zakat is not obligatory on your portion of the building; rather, it is on its revenue after rental, if that occurs. Since you sold the share, you begin a new year with its price, and zakat becomes obligatory on it if a year passes and it does not fall below the nisab. However, if a lunar year has passed while maintaining the intention for trade, then zakat is obligatory if the share reaches the nisab after deducting deferred installments; otherwise, there is no zakat. There is also an opinion that only the current installment should be deducted, not the other deferred installments.