Is zakat obligatory on an apartment designated for residence after the intention to sell it, and is zakat obligatory on one-third of a plot of land that was sold after years of partnership and no benefit derived from it?

Land purchased with the intention of trade is subject to zakat every year, assessed at its market value, including any structures on it, when a full year has passed. Each partner must pay zakat on their share if it reaches the minimum threshold (nisab). As for an apartment that was intended for trade but whose intention changed to residential use, there is no zakat on it, because a trade commodity becomes an asset for personal use (qinyah) simply by changing the intention. However, the proceeds from the sale of land are subject to zakat.