How to prove that the property has not been maintained?

Taking photos with a mobile phone can be used as evidence. To prove that the property has not been maintained, you can take photos with your mobile phone, which can be used as evidence, such as garbage everywhere, grass dying, rusty equipment and so on. By convening the owners' meeting, signing the property service contract with the selected property management enterprise on behalf of the owners, and establishing the owners' committee, it is legally binding on all owners.