Marion County Indiana landlords must participate in a registration of their homes with the City of Indianapolis. Beginning in 2015, landlords must use a new online landlord registration site. Any property owner failing to register their properties could be subject to a fine.
The actual owner must create an account within this system. The owner then may register each property they own and also list parties that may be also considered responsible (i.e. a property manager). The benefit for out of state owners to listing a responsible party is many violation notices are sent via US Mail. A local representative will likely receive the violation with time to correct it where the owner may not receive until the day the penalty kicks in.
Here is a post we wrote on the registration process in 2017. The system still works the same. Definitely recommended if you own Indianapolis-Marion county property.