Android Helicopter unique buildings

[Sudip]

Which buidings for flying helicopters are unique that can not be removed any more? And which of these buildings require roads?

 

[Wasted Eagle]

All helicopter related buildings are 2x2.

Terminal H: unique, road
Repair Base H: unique, road
Command center: unique, no road
Fuel station H: unique, road
Resource base: road, sellable, no warehouse (Thanks to @fertob ’s observant eye... )
Meteorological lab: road, sellable, no warehouse
Mechanical plant: road, sellable, no warehouse
Hi-tech plant: road, sellable, no warehouse
Helipads: no road, sellable, no warehouse

 

[Sudip]

All helicopter related buildings are 2x2.

Terminal H: unique, road
Repair Base H: unique, road
Command center: unique, no road
Fuel station H: unique, road
Meteorological lab: road, sellable, no warehouse
Mechanical plant: road, sellable, no warehouse
Hi-tech plant: road, sellable, no warehouse
Helipads: no road, sellable, no warehouse

Thank u so much..

 

[fertob]

All helicopter related buildings are 2x2.

Terminal H: unique, road
Repair Base H: unique, road
Command center: unique, no road
Fuel station H: unique, road
Meteorological lab: road, sellable, no warehouse
Mechanical plant: road, sellable, no warehouse
Hi-tech plant: road, sellable, no warehouse
Helipads: no road, sellable, no warehouse

Resource Base (Level 1, 2 & 3) : sellable, road, no warehouse.

Tourist Building (for passenger):
- Guest House, Country Estate, Stone Cottage, Travel Bureau. (road, sellable, warehouse).