A DBI permit filed in February 2006 for 715 Monterey Boulevard describes its scope of work in a single line: "enlarge garage door… move ext. stairs to enlarge garage door." The exterior stairs moved so the car could fit. That permit, compressed into a building department scope field, encodes a transaction that played out across Sunnyside's ground floors for the better part of a century. The automobile arrived, and the lowest level of the house made room.
Sunnyside was built as a streetcar neighborhood. The SF & SM Electric Railway began service on April 27, 1892, and the residential development that followed assumed pedestrian access from transit stops. The Western Neighborhoods Project notes that fewer than 5 percent of Sunnyside's 2,250 lots had been built on by 1900, but the houses that did go up in the 1900s and 1910s faced the street with raised entries, front stairs, and setbacks scaled to people on foot. The 1915 Sanborn maps for Sunnyside's older blocks show wood-frame dwellings with uniform setbacks and no driveways. The ground floor belonged to the staircase and the foundation.
Then the streetcar's hold loosened. The 26-Ocean View line was abandoned in 1938. After 1940, the 10-Sunnyside operated as rail service only during rush hours. The houses stayed. The transit that justified their location did not. By the 1920s, as KQED has reported, cars were popular enough in the Bay Area that new houses were being built with garages and older houses were being adapted. SFGATE quotes historian Woody LaBounty noting that the business of carving garages into older homes flourished in the 1920s, with another boom in the 1950s.
The DBI permit dataset provides searchable scope descriptions mainly from the 1980s forward, so it cannot document every decade of that transition in Sunnyside. But the permits it does contain reveal a vocabulary of ground-floor modifications that any walker can learn to spot. Four recurring types appear across the neighborhood's streets.
The garage door and the relocated stair
The most legible modification is the one at 715 Monterey: an existing garage opening widened, the entry stairs physically moved to accommodate it. The same pairing appears at 254 Joost Avenue, where a 1987 permit describes the scope as "rebuild front stair/install new garage door." Both permits record two changes as a single project because the changes are functionally inseparable. The stair cannot stay where it is if the garage door is going to be wide enough for a modern car.
The result is a ground floor reorganized around the vehicle. Look for it: garage door at center or pushed to one side, entry stairs compressed into whatever width remains. On blocks where some houses have been modified and others have not, the contrast is sharp. The unmodified house presents its original stair as the primary ground-floor element, the steps rising toward the front door at a width that assumes the stair is the entrance, not a concession. The modified house presents its garage door first. The stairs, wherever they ended up, are narrower, steeper, pushed to the margin.
The doubled opening
At 1100 Monterey Boulevard, a 2006 permit describes the scope as "add new garage door next to existing garage door." Not enlarging an opening but doubling it. The house already had a garage; the permit added a second door, presumably for a second car. From the sidewalk, a double-width garage opening dominates the facade in a way a single door does not. The ground floor becomes almost entirely vehicle infrastructure, two dark rectangles side by side, and the entry reads as subordinate wherever it sits.
The curb cut that wasn't
Two Sunnyside curb-cut applications in the DBI dataset were cancelled rather than completed. At 167 Hearst Avenue, a 1986 application to "cut curb to allow for off street parking" was cancelled. At 300 Foerster Street, a 1992 application for a "curb cut at sidewalk" was also cancelled. Whether the applicants withdrew or the city denied the permits, the record does not say.
A curb cut is the one ground-floor modification that changes public space, not just private property. It removes a section of sidewalk curb, narrows the effective pedestrian path, creates a driveway crossing where there was none. The cancelled applications are evidence that the automobile's claim on the ground floor was not always granted. And this is a modification type you can verify from the sidewalk by looking for its absence. Walk past 167 Hearst or 300 Foerster and what you see is an unbroken curb, a continuous sidewalk edge, the public right-of-way intact. The curb held. The permit record is the only place that remembers someone once asked it not to.
The garage reclaimed
The most recent chapter runs in the opposite direction. Beginning in the late 1980s, DBI permits document Sunnyside homeowners converting garage space back into habitable rooms. At 596 Monterey Boulevard, a 1989 permit describes the scope as "to convert (e) garage at ground floor." At 312 Detroit Street in 1992: "const fam room storage rm and half bath at rear of garage." At 519 Foerster Street in 1995:
"convert existing garage int0 new bedrm hallwy & bathroom"
The typo is the permit system's, preserved here because the DBI scope field is a public document, not a publication. At 207 Congo Street in 2000: "new bedrm & bathrm at garage/storage level."
These conversions reverse the earlier transaction. Space that was carved out of the house for the car is carved back for the household. A garage becomes a bedroom, a family room, a bathroom. From the sidewalk, the tell is sometimes a window where a garage door used to be, daylight and curtains where there was once a dark opening. Sometimes the original garage door remains in place, now decorative, sealing off a room that no longer holds a car.
At 325 Mangels Avenue, a 2000 permit captures both directions in a single project:
"construct 1st fl hall to new bedrm/study & (n) bathrm. relocate door to garage, install new windows"
The garage door moves; the bedroom arrives. The ground floor is renegotiated again.
Reading the pattern
These four modification types are not equally visible from the sidewalk. A widened garage door is obvious. A relocated stair requires knowing where the stair used to be, which the Sanborn maps or the neighboring unmodified house can sometimes show. A cancelled curb cut leaves no physical trace at all, only a permit record and an unbroken curb. A garage conversion may announce itself as a window where a dark opening used to be, or it may hide behind the original garage door, now merely a wall.
Once you see the pattern, though, it reorganizes the streetscape. Walk any Sunnyside block where the houses predate the 1940s and look only at the ground floor. The houses with their original entry stairs, centered or offset, no garage opening: the car never reached them. Next door, a garage door cut into the facade, stairs compressed to one side: that house absorbed the transition. And farther along, a garage door still in place but a window occupying what was once a dark opening: the ground floor changed hands yet again, the household reclaiming space from the car.
The postwar blocks read differently. On the east side of Mangels between Detroit and Edna, where nearly every house dates to 1960 or 1961, the garage was part of the original design. Those ground floors were never retrofitted because they were built for the automobile from the start. A pre-1920s Foerster Street facade and a 1961 Mangels Avenue facade, set side by side at the ground floor, would show the difference between a house that was adapted and a house that was planned. Both are legible, both are Sunnyside, and you can read either one from the sidewalk if you know which floor to look at.