Create a subsummary report that sorts by property. Create a summary field that is a running total of your spend field. Place this field in the subsummary section of the layout. Once the report is created you can export it as pdf or excel. If export as excel make sure you "group by" property.
If you are unsure of how to do this consult the FileMaker Training Series. There is a whole chapter dedicated to reporting. Or check out this article, http://filemaker.custhelp.com/cgi-bin/filemaker.cfg/php/enduser/std_adp.php?p_faqid=6198&p_created=1161189372&p_sid=OuiO3iVj&p_accessibility=0&p_redirect=&p_lva=&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9MTEsMTEmcF9wcm9kcz0mcF9jYXRzPSZwX3B2PSZwX2N2PSZwX3BzX2Fuc191cGRhdGVkPSZwX3BhZ2U9MSZwX3NlYXJjaF90ZXh0PXN1YnN1bW1hcnkgcmVwb3J0cw**&p_li=&p_topview=1
Let me know if you have any questions