the driveways between the adjacent buildings

There are three buildings along the same stretch of road next to one another. Lets call them Building A, Building B and Building C. Both the hearer and I are talking about Building B.

• Building B is in the middle.
• There is a driveway between Building A and Building B
• There is a driveway between Building B and Building C

I would like to tell them about the driveways.

If I say

the driveways between the adjacent buildings

Does that make sense?

And if I were to say there are two driveways, should I say

There are driveways on either side of Building B

or

There are driveways on both sides of Building B

Are you sure you don't mean alleys?

Alley: a passage, as through a continuous row of houses, permitting access from the street to backyards, garages, etc.

vs.

Driveway: a road, especially a private one, leading from a street or other thoroughfare to a building, house, garage, etc.

To me - a driveway would connect to a specific building/location, whereas the concept of a passage/road between several buildings in a row more describes an alley. (maybe this is a US English specific preference).

To answer your questions:

The driveways/alleys between the adjacent buildings

The above makes sense.

There is a/an driveway/alley on either side of Building B

There is a/an driveway/alley on both sides of Building B

For both, I would make it singular, as you are talking about one on each side. I am being a pedant, but the reason is the plural form could indicate multiple driveways/alleys on either side.