HouseWindow.cs

using System;

class HouseWithWindow
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        int dots = n - 1;
        int innerDots = 1;
        Console.WriteLine("{0}*{0}",new string('.',dots));
        for (int i = 0; i < n-2; i++)
        {
            dots--;
            Console.WriteLine("{0}*{1}*{0}",new string('.',dots), new string('.',innerDots));
            innerDots += 2;
        }
        Console.WriteLine("*{0}*",new string('.',2*n-3));
        Console.WriteLine("{0}",new string('*',2*n-1));
        int cycleSpins = (n - n / 2) / 2;
        for (int i = 0; i < cycleSpins; i++)
        {
            Console.WriteLine("*{0}*", new string('.', 2 * n - 3));     //copy later
        }
        int windowDots = ((2*n-3)-(n-3))/2;
        for (int i = 0; i < n/2; i++)
        {
            Console.WriteLine("*{0}{1}{0}*", new string('.',windowDots), new string ('*',n-3));
        }
        for (int i = 0; i < cycleSpins; i++)
        {
            Console.WriteLine("*{0}*", new string('.', 2 * n - 3));
        }
        Console.WriteLine("{0}", new string('*', 2 * n - 1));
    }
}