An urban infill lot in Lima, Peru, 206 feet long and 43 feet wide, with a jog in the middle, might not seem optimal for a single-family home. But the Peruvian firm 51-1 Arquitectos encouraged its clients, a couple with four children, to work within those parameters. “We could imagine an extraordinary garden tying together the different parts of the house,” says 51-1 principal Fernando Puente Arnao. The family already lived at the west end of the site in this residential neighborhood of Lima, in a two-story 1980s brick-and-concrete townhouse that they owned but had outgrown. A high priority was more outdoor space, where the kids could safely play. So they followed 51-1’s advice and bought the property, then on the market, whose yard was back-to-back with theirs.