let speed = 1.8;

​

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(220);

  scrollCity(x);

  scrollCity(x+width);

  x-=speed;

  if(x <= -width) x = 0;  

}

​

function scrollCity(x) {  

  push();

  translate(x,height-100);

  rect(0,0,width,100);

  rect(0,-100,70,250);

  rect(100,-50,200,150);

  pop();

}