Looking to connect my Office with Home and Employee Homes, 10km.

Hi, first of all, its for testing purpose and not for permanent deployment, so lets not discuss about legality about it.

So, here is the scenario.
I have a 10mbps connection at my office. Now, I want to share it with my home which is 4kms from my office.
And 3 other employees are who are within the radius of 10km..

1st project is connecting Home with Office.

Office is 3 storey and Home is 4 storey.
So, what setup and equipments do you recommend, so I can purchase it this week and start the testing.