The Cunard Building is primarily used by Liverpool City Council, lucky things. They used to offer tours, but that stopped before Covid, because, inevitably, of ‘security’, which probably really means it was a bit of a hassle. However, when I last tried, again before Covid, you could walk through the ground floor to the information/reception desk in the middle, and out the other side. Even that gives an impression of the splendours of the building’s interiors.