How is the zakat of money invested in a real estate project under construction and jointly owned assessed and paid, given the varying hawls of the partners and the funds received from sales?

Zakat is obligatory on every partner in a contracting business if their share reaches the nisab. Each partner must pay Zakat on their share independently. Zakat on trade goods is due when a hawl (full lunar year) has passed. The partner's share of materials prepared for trade is to be valued at market price, in addition to cash liquidity and any other trade goods they own. It is not permissible to delay the payment of Zakat after it becomes due.