How many years has the Party School of the Provincial Party Committee invited tenders for century property contracting?

It's been three years. Because the labor cost of property management is relatively large, and the labor cost is rising constantly, so the signing time is too long, which will easily lead to increasing income and the property is in a state of loss. Therefore, it is necessary to change the property contract within three years, and the party school of the provincial party Committee usually signs a three-year tender century property contract. Bidding is a process of economic activities between tenderers and bidders through invitation, response and selection, and finally forms an equal subject with agreement and contract relationship.