My company works in a residential area, and the property management said that we should pay 50% more for the property fee. Is it reasonable?

It's hard to say whether it's reasonable.

From your point of view, as the owner of the community, you have the same rights as other owners, so how to calculate the property management fee?

From the perspective of the property management company, the company you run has increased the frequency of people coming in and out of the community, which can involve the workload of the community staff, such as questioning people you don't know, cleaning, using elevators and so on. And the cost of service has increased, you should be charged more property management fees.

If you think it's too much, you can negotiate with the property management company. After all, "changing residence to business" is still in dispute. Of course, this matter is unfounded. You can also stay the same.