neighborhood: Central Park

original sketch

3 columns and 3 rows of houses = 1 block

3 columns and 3 rows of blocks = entire region

2nd row = Central Park

#this is where your code should go
size(700,700)
background(255)
x = 5
y = 5
a = 10
b = 20
DL = 30
squareSize = 20
spacing = 3
#this is left side block
for column in xrange(0, a-2):
    for row in xrange(0, DL):
        if column == 02 and row == 25:
            fill(255,0,0)
        else:
            fill(255)
        rect(x + column * (squareSize + spacing), 
             y + row * (squareSize + spacing), 
             squareSize,squareSize)
#this is right side block
    for column in xrange(b+2, DL):
        for row in xrange(0, DL):
            if column == 25 and row == 27:
                fill(255,0,0)
            else:
                fill(255)
            rect(x + column * (squareSize + spacing), 
            y + row * (squareSize + spacing), 
            squareSize,
            squareSize)
#this is central park            
        fill(9,148,65)
        #fill(96,168,48)
        #fill(159,218,64)
        rect(x+a*(squareSize + spacing),
             y,
             (b-a)*(squareSize + spacing),
             DL*(squareSize+spacing)-spacing)