Yournewstorefront.com is designed to allow building owners and potential short-term tenants to connect. Basically, a landlord can list a property for short-term usage, and a tenant can select days to use the property and lease it directly online.
If you create an account, you can log in and "add a property" to list your own properties for lease. When you add a price, bear in mind it's a price PER DAY. The system will use that price to generate the right total price for the tenant.
If you're looking for space, just go to the property you want and click "reserve this property." You'll be able to pick dates and pay via Paypal.