From Curbed LA:

Dubbed the Silver Lake Twins, the two homes, both of which are three-bedrooms, three-baths, are located at 3422 Fernwood Avenue (2,600 square feet) and 426 Fernwood Avenue ( 2,200 square feet) and priced at $349,000 and $337,000, respectively, although a disclaimer: price includes land only, with rights to contract with prefab companies Empyrean and Res:4 to finish the design/construct a Dwell home.

The real estate listings at the Value of Architecture have a little more info:

Perched on a rocky promontory with panoramic views of the Hollywood Hills, from Griffith Observatory to Century City, the side-by-side Silver Lake Twins fit well within the modernist architectural tradition of the neighborhood and point to the future of prefabrication in home design.

Curbed readers had mixed feelings:

Those retaining walls are $150-$200k alone. That's a pretty gnarly grade.

Also, seems chances are slim that it will be 'twins' given the effort it's going to take. Anybody really believe two seperate parties are going to end up creating identical properties.