What responsibility should the property legal person bear if the fire escape is changed into an office explosion?

If it is because the construction unit fails to pay the property right house as required, it will be reported to the real estate department for handling.

If it is because the property service enterprise changes the use of the property premises without authorization, and then illegally builds the property premises in other places, it will be reported to the real estate authorities for handling. If there is any income, the income belongs to all owners.

As you said, in this incident, if the construction unit has paid the cost to the property in proportion, the property will take full responsibility. If the construction unit fails to pay the property, the responsibility shall be borne by the construction unit.