My unit should belong to a property management company. If I declare online, how should I declare it?

It's hard to say that different provinces and cities have different online declaration software, with and without income, and different provinces and cities have different declaration methods and methods.

Personally, I suggest you contact the tax administrator of the competent tax authority directly. That is, you can deepen your feelings and communication, and you can also solve your own problems directly. Both sides are suitable.