Urgent! How to solve the problem of water leakage of building balcony drainage pipe because of air conditioning hole? Who is in charge? Should the property be notified to avoid future troubles?

Generally, when decorating, you can directly refer to the property for building water and electricity drawings (I guess you don't want it). Now you can explain to the property that you broke the drain pipe, and let the property send someone to supervise the decoration company to repair the pipe and make records, so that the property management can find out the reason in the future and exempt you from some responsibilities. Be rational and orderly. So that the property will not bother you in the future. . . . But if the property management there is bandits, I suggest you let the decoration company fix it for you. The quality of this kind of pipeline repaired by general decoration companies is no problem. . . For reference only, good luck. . . .