e: half correct, they were in SF, moving to a new SF office but he wanted instead for the new office to be in Daly City:
"Then, when it came time to relocate from one San Francisco office to another, Wong put his foot down, Reddit sources say, and said he wanted to move the company to Daly City.
“I felt that locating an office in San Francisco proper is an incredibly difficult thing given the strains the city is facing and the high rents it imposes on employees who wish to live close to the office,” Wong said"
http://www.siliconbeat.com/2014/11/14/yishan-wong-leaves-red...
Unofficially, he was burned out, and he used that as his excuse to quit.
(the new office was probably why he wanted everyone to relocate to SF, so everyone could come work at this huge new office he wanted for the team)
Let's be perfectly honest here: that was Yishan's thing. He announced that change and set it into motion before he resigned.