If you want to delete a property, you can do it from the control panel. You have to go to Properties / My properties in the main menu.
Once inside your properties, you will see an orange Edit button in the right column of each property.
All the available options for editing the property will open.
To delete the property in question, you have to go to Options, which is the last of the tabs, and click on the Delete this property button found at the bottom right.
A confirmation window will open. Remember that once the property is deleted you will not be able to recover it.