As Propertybase is an app on Salesforce the Salesforce limits are counting for Propertybase, too.

Propertybase comes with the "Enterprise Edition" of Salesforce.

Salesforce Limits Quick Reference Guide

API Usage Limits

If you can not find the report API Calls Made Within Last 7 Days :

https://na1.salesforce.com/00O?rt=104&retURL=%2F00O&c=UN&c=FULL_NAME&c=EM&c=CID&c=TS&c=CC&duel0=FULL_NAME%2CUN%2CEM&scope=organization&details=yes

Replace the na1 with your instance.  Below is the same url without the na1.salesforce.com

/00O?rt=104&retURL=%2F00O&c=UN&c=FULL_NAME&c=EM&c=CID&c=TS&c=CC&duel0=FULL_NAME%2CUN%2CEM&scope=organization&details=yes