House struct example

ApartmentTower.swift

struct ApartmentTower {
    struct Concierge {
        var name: String
    }

    struct Renter {
        var name: String
    }

    var concierge: Concierge
    var renters: [Renter]
}

House.swift

struct House {
    struct Inhabitant {
        var name: String
    }
    
    var inhabitants: [Inhabitant]
}

HouseAdaptors.swift

extension House {
    init(manor: Manor) {
        let staff = manor.staff.map { Inhabitant(name: $0.name) }
        let owners: [Inhabitant] = [.init(name: manor.lord.name), .init(name: manor.lady.name)]
        self.init(inhabitants: owners + staff)
    }

    init(apartmentTower: ApartmentTower) {
        let concierge = Inhabitant(name: apartmentTower.concierge.name)
        let renters = apartmentTower.renters.map { Inhabitant(name: $0.name) }
        self.init(inhabitants: [concierge] + renters)
    }
}

main.swift

let manor = Manor(
    lord: .init(name: "Lord Pennyworth"),
    lady: .init(name: "Lady Pennyworth"),
    staff: [.init(name: "Jenkins"), .init(name: "Nanny Jones")]
)

let apartmentTower = ApartmentTower(
    concierge: .init(name: "Alex Smith"),
    renters: [.init(name: "Sam Thomas"), .init(name: "Mary White")]
)

let street = Street(houses: [.init(manor: manor), .init(apartmentTower: apartmentTower)])

Manor.swift

struct Manor {
    struct Lord {
        var name: String
    }

    struct Lady {
        var name: String
    }

    struct Staff {
        var name: String
    }
    
    var lord: Lord
    var lady: Lady
    var staff: [Staff]
}