The same with the housing estates especially the elite ones, apartments like this st kilda accommodation, for example, also usually have other costs associated with the treatment of the apartment. Then, when before buying the unit of the apartment, you need to ask clearly whether there will be any additional cost for anything after you enter the apartment. In this way, you will be able to know if the price will still be normal or exceed the limits of the reasonable price.
You also need to compare the methods how these costs must be paid. For example, there are some apartments that have irregular payment systems where the resident must pay for the electricity at the 1st day of the month, the water in the 2nd, gardeners in the 3rd and so on. It is, of course, inconvenient compared to the apartment that uses the method for the payments by collecting all these things only once.