int x = 450;  
int y = 150;
int spacer = 9; 
int hgt = 220; 
int endBldg = 540; 

void setup() {
  size(600,400);
  background(255); 
}

void draw() {
  
  noLoop(); 
  rectMode(CENTER); 
  fill(0);
  //building 
   rect(x+40, 260, 110, 260);
   rect(x+40, 120, 80, 40);//roof top
   rect(x+40, 90, 30, 20); //roof top
 
 //elongated windows
  stroke(255); 
  strokeWeight(4); 

  while(x < endBldg) {
  line( x, y , x , y+ hgt);
  x = x+spacer; 
  }
  
}