Hide Database or limit access to database

Hi

I have three database in a sql server .I donot want to delete database or detach .What I want to do is limit the B1 user to limit access to database or company.

For example

i have three company like

arizona office

Newyork office

California office

I donot want California office employee to log into Newyork office.Is any way SAP business One security policy help me to do that .

Answers will be rewarded

Thank you