How do I create a relatively simple random 2d city grid? (includes image)

I am trying to create a city street grid like this in a two dimensional array (ignore the green parts).

I want to provide the city's width and length in meters and get an int[x,y] array with the values for each coordinate. Each pixel in the image represents a 10mx10m square, which is the smallest subdivision in my map, so for each pixel I would have map[x,y]=1 if there's a street, or a 0 if it's not a street.

For the creation I have two parameters:

 int [,] blockDimensions = new int[,] {{300,80},{200,80},{140,80},{120,80}}; // in meters
 int[] streetWidths = new int[] {10,20,40}; // in meters

blockDimensions is the standard block dimensions for the city, but obviously the city cannot be a perfect grid with three (or more) different block sizes, which can be horizontal or vertical, which is okay, as no city has a 100% perfect grid. The important thing is that the majority of the blocks have these dimensions and the city map looks realistic. Also, the blocks should not all have the same orientation, the same size can appear horizontally or vertically.

streetWidths is the acceptable street width range, nothing can be wider than this. The smallest value (10) is auxiliary and should randomly split big blocks, not sure how to use it yet.

One more thing, The grid sizes are based on real cities (New York City) and Wikipedia said that they start at the middle of the street. So with 10m units, for a 120x80 block we would have:

 111111111111
 100000000001
 100000000001
 100000000001
 100000000001
 100000000001
 100000000001
 111111111111

This, attached to another block would create a 2px street between them which is acceptable. But it really doesn't have to be like that, as long as it looks realistic, if it's easier not to include the street widths in the block, I'm fine with it.

Any one knows of an algorithm that I can use as a base to build something like that? I am not expecting a complete solution obviously, but any hints would be appreciated.

Something like this would be perfect as well, although some end blocks would have to be removed to give a more realistic shape (there are no completely square cities):