If AddressAccelerator is set up to validate addresses automatically the address will always vaildate in proper case. 

When validating addresses as a group the following options are available:
  1. Click Data Health Center in Raiser's Edge
  2. On the AddressAccelerator line click Validate Addresses.
  3. The Update Addresses screen appears.
  4. Select the Process Options tab.
  5. In the Address Capitalization frame, select either Proper case address or Capitalize entire address.
Note: In Raiser's Edge 7.71 go to Admin, Data Enrichment Services instead of the Data Health Center to access the group validation option for AddressAccelerator.