One source reported that Platt's Hall opened in 1860. Jack Tillmany reports that the first newspaper accounts of events there that he found were in July 1862. The building was on the NE corner of Montgomery and Bush.

It's listed in an 1882 "Guidebook and Street Manual." It was still operating as late as 1885. The Mills Building was later on the site.

http://sanfranciscotheatres.blogspot.com/2019/01/platts-hall.html

See Red Dog, California facts for kids

Otsego Hotel opened in April 1904 on the previous site of the Hibbard House, which was built in 1865 and razed in 1901 after its manager, Henry Haden, died.

As Jackson began to grow as a railroad mecca in the mid-1860s, hotels began to spring up near the now historic depot the trains arrived to and departed from.

One of them - perhaps the most elegant of its time - was the Hibbard House, a four-story structure built in 1865 by Jackson businessman and stagecoach tycoon Daniel Hibbard at what's now the corner of E. Michigan Ave. and Francis Street.