using System;

using System.Threading.Tasks;

​

public class Program

{

    public static void Main() => Task.Run(() =>  MainAsync()).GetAwaiter().GetResult();

    public async static Task MainAsync()

    {

        var building = new Building();

        building.Create();

        Console.WriteLine(await building.Build());

    }

}

​

class Building

    {

        private int floors;

        private bool hasRoof;

        private bool hasBalcony;

        private string matetial;

​

        public Building()

        {           

        }

​

        public void Create(int floors = 1, bool hasRoof = false, bool hasBalcony = false, string matetial = "BRICK")

        {

            this.floors = floors;

            this.hasRoof = hasRoof;

            this.hasBalcony = hasBalcony;

            this.matetial = matetial;

        }

        public async Task<string> Build()

        {

            var roof = hasRoof ? "Has roof" : string.Empty;

            var balcony = hasBalcony ? "Has balcony" : string.Empty;

            await PaintAsync(floors);

            return $"Floors: {floors}; {roof}; {balcony}; Material : {matetial}";

        }

        private async Task PaintAsync(int floors){

            for(int i = 0; i < floors; i++){                

                await Task.Delay(1000);

            }

        }

    }