Flat roof, glass on three sides, single glazing, no shadow, only small sections that could be opened for ventilation, no blinds, no air conditioning.

That glass cube must have been a veritable oven in the height of summer.

["Summer" is a relative term in San Francisco. -tterrace]

The skeleton of a similar old-timey filling station still exists at 16th and Irving: https://goo.gl/maps/pQZjTTH7tgw

I see 3 Bell Telephone Systems signs. That tells me that the phone was likely a moneymaker. Another observation, the entrance to the Men's Room was probably on the other side the building, backing up to the Women's.

That 20 cents per gallon in 1925 would be $2.71 today.

Two white public telephones seen through window? Must be a very new station, evenly spread gravel, no grease stains near pumps, no tire marks leading into or away from the station. Very modern, open and clean design. How many women drivers in that era?

Here's a gas station rebuilt on private property in Santa Rosa CA. Signal Gas, similar but even smaller than the Gilmore station. Also the Gilmore lion.

According to this document, the Twiggses built their boats at the corner of Stockton and North Point.

[As noted by SteamBoomer, by the 1920s the boatyard had moved to a location bounded by Illinois, 18th and Third (Kentucky) streets. Below, an ad from the 1925 San Francisco City Directory. - Dave]

According to my (now deceased) grandmother, those were the types of bathrooms you had to back into. No word on whether you dropped trou before or after backing.

Can't imagine there was a sink in there. Maybe if you wanted to wash afterwards, you wrestled the hose from a newsie?

was a lot larger than the landscaping budget for those 4 bushes.

Click to enlarge.

Calendar seems to be an ad for Chesterfield Cigs.

In 1930, the barnstormer and air racer Roscoe Turner persuaded the Gilmore Oil Company to buy a snazzy Lockheed Air Express, which was emblazoned with Gilmore 'Red Lion' logos. Turner later bought a lion cub -- inevitably named 'Gilmore' -- and flew with him throughout the country. The lion even had a parachute.

According the Smithsonian, "with the possible exception of the Cowardly Lion in The Wizard of Oz, Gilmore became the most famous lion of the 1930s."

This appears to be the northeast corner of 18th and 3rd/Kentucky Streets. The fence of John Twigg & Sons boat builders, at 18th and Illinois Streets, can be seen in the background.

Is like Dr. Who's Tardis, it get bigger on the inside.

This gas station looks substantially larger than yesterday's barbershop (not to mention much brighter). However, the women's room looks a bit on the narrow side.