I'm hoping that someone may be able to help with recommendations of Insurance providers that will write a policy for a 23,000 sqft warehouse type space.  I've received 1 quote and it seems very high.  

@Craig Hansen This class of business can vary greatly depending on the type of tenant and what they are storing or how they are using the space.  If the tenants are lower risk, there should be many affordable options with any of the national companies. Too many to mention.

Definitely get 2-3 more then. Does your existing insurance issue commercial policies?

@Ronald Rohde I have a provider for my other buildings but they are coming in very high.  I will be getting additional quotes to try and make this deal work