Capitol Hill streets and building parcels are almost uniformly delineated by an orthogonal grid; however, when confronted with the second part of our neighborhood’s name the ubiquitous grid revealed its limitation as an all-inclusive planning tool and left city planners little choice but to utilize diagonal streets to ascend and descend our heights. Diagonal streets present a foil to the well-ordered grid, yet most buildings conform to the grid even when the site is an unconventional shape. There are reasons to stay square when designing a building, but design opportunities are sacrificed when the only nod given to an atypical, non-orthogonal site is to design an orthogonal building and treat its diagonally bounded site simply as a remainder to be ‘planted-up’.

The Hill’s longest and steepest diagonal street, Belmont Avenue, exhibits a variety of design solutions to the grid’s disruptive diagonal. The first approach, illustrated in two variants below, plays to both diagonal and grid in a manner that preserves the conflicting geometries. The third solution is a rarely seen hybrid approach where the geometries of grid and diagonal are blended and create unexpectedly complex forms. which gave us a pair of delightful mid-century apartments. Continue reading →