That is a problem that I had before. Neither the property owner or the bank would agree to pay for the lawn maintenance. I had to just let it grow. I don't know the solution unless you want to do it yourself. I was lucky to get a commission at all, let alone lawn maintenance. Luckily, the property sold in about a month, but this really bothers me to see an unkept property.
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Comments made are my opinion, and not intended to be legal advice of any kind.