1-   https://www.al-feqh.com/en/rules-of-zakat-in-islam-and-its-conditions#ix6" rel="nofollow - Conditions of zakat  : The Nisab is required to be more than what is necessary for the basic needs of man e.g. feeding, clothing, shelter etc. This is because Zakat has been ordained as a support for the poor. It is therefore important that the payer of Zakat is not in need himself.

2- The Nisab must completely belong to a particular individual. Zakah is not paid from money or property that does not belong to a specific person. For example, money that was contributed towards building a mosque, an endowment set aside for the well-being of a community, or properties in the treasuries of welfare or philantropic organizations.
source: https://www.al-feqh.com/en/rules-of-zakat-in-islam-and-its-conditions#ix6