The homeowners have a modern aesthetic, but wanted to respect the traditional appearance of the house from the street side. There's a pretty striking contrast between the old front and the new back. This differentiation happens inside too - the new beam spanning the opening to the new space delineates new and old, while the existing but remodeled kitchen mediates between them.
The two-story "storage block" is really the "design core" of the project, and grounds every other part of the project around itself. At the upstairs, it acts as display/storage, and as a railing for the stairwell. At the stairs, it becomes a book wall, and at the new basement master suite, it becomes an elegant wood design element with some minimal display niches, and a barn-style sliding door. It also provides some storage in the space off the bedroom, under the stairs.
Adjacent to the storage wall at the upstairs is a frosted glass railing that acts as a lantern. It diffuses the light throughout the space, both natural - during the day - and artificial - at night (a pendant light is centered in the stair well behind).
The biggest improvement in the remodel is the amount of natural light - as in many traditional (in this case Tudor) style houses, the small windows limited the light.
The project incorporates many beyond-code green strategies, including a warm roof (i.e. non-ventilated), rain-screen siding, etc.