Below is the same view from September of 2019.

I wonder why "No Heavy Teaming"? Was it to reduce vibrations in the observatory telescope or were they afraid of damage to the road surface?

[Today's equivalent would be "No Trucks Over X Tons" signs on residential streets. -tterrace]

From East Ave on 6/8/2017.

It used to be Peristalsis.

The Warner Observatory (dome at right of photograph), financed by Hulbert Harrington Warner, was completed 1882 and the building was demolished 1931.

The History And Work Of The Warner Observatory:

“The Warner Observatory is distinctively a private institution built for the purpose of original discovery rather than the ordinary routine work of most other observatories. The desire of its founder was that the great telescope (then the third largest in the United States) be used in such work; so, selecting as my principal field of labor, the discovery of new nebula, which, since the death of the Herschels and of D’Arrest, had been much neglected, and to which work the quest for faint comets had well trained my eye (an important factor), and also because of its congeniality to my taste (another influential consideration), on July 9, 1883, a thorough and systematic search was inaugurated for this class of objects, which were popularly supposed to have been exhausted, a verdict which the fair measure of success, up to this writing, quite disproves. In this work occasional assistance has been received from my son Edward, now a lad of fifteen years, who has discovered twenty-one.”

Full text, with description and interior photographs.

NO HEAVY TEAMING OR FAST DRIVING ALLOWED.