What is a cadastre number and why does the registry need it?

The cadastre number is the state property register’s identifier for premises that exist in law. It matters at company registration because of what the act checks: an address stated in the founding documents but absent from the databases of the tax and cadastre authorities is a ground for refusing the registration outright. The act names the databases rather than the number, and the cadastre record is what puts an address in one of them. (Registration Regulation, Para. 40 — lex.uz ↗)

With a cadastre record the premises are verifiable by the registry and, later, by the bank; without one the address is only an assertion. That is the reason virtual offices fail and real addresses pass — and the reason an address is a document question rather than a property question when a foreign founder is choosing one.