I have a scenario where need to create a console application for creating site collections. We are being asked to use tenants. I am wondering if I can create a tenant admin site using CSOM.I believe we can do it using powerhshell which I m not asked to use coz everything in my case is client side.

Hi Suraj,

Yes, you create site collection with a specific site template using Client Object Model against SharePoint Online.

A code demo in the blog below would be helpful:

http://www.vrdmn.com/2014/03/create-site-collections-with-csom-in.html

More information about the available site template codes for your reference:

http://www.funwithsharepoint.com/sharepoint-2013-site-templates-codes-for-powershell/

Thanks 

Patrick Liang