GMSIndoorBuilding
@interface GMSIndoorBuilding : NSObjectDescribes a building which contains levels.
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                  Array of GMSIndoorLevel describing the levels which make up the building. The levels are in ‘display order’ from top to bottom. DeclarationSwift var levels: [GMSIndoorLevel] { get }Objective-C @property (nonatomic, strong, readonly) NSArray<GMSIndoorLevel *> *_Nonnull levels;
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                  Index in the levels array of the default level. DeclarationSwift var defaultLevelIndex: UInt { get }Objective-C @property (nonatomic, readonly) NSUInteger defaultLevelIndex;
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                  If YES, the building is entirely underground and supports being hidden. DeclarationSwift var isUnderground: Bool { get }Objective-C @property (nonatomic, readonly, getter=isUnderground) BOOL underground;
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                  Unavailable DeclarationObjective-C - (instancetype)init NS_UNAVAILABLE;