How is 由此 (yóucǐ) = "herefrom" used? I see this sign near one of the cafeterias at Nankai University.

It says:

二楼新宇餐厅由此上楼
èrlóu xīnyǔ cāntīng yóucǐ shànglóu
second floor Sinew cafeteria; herefrom go upstairs

Where 新宇 (xīnyǔ; Sinew) is the company name.
I'm interested in 由此上楼, and particularly how 由此 is being used.  I guess it makes sense, effectively meaning &quot;go upstairs here&quot;, although I would expect some combination of 这里 (zhèlǐ; here） and 上楼 (shànglóu; go upstairs) to work.  The question Are there any online resources for learning Chinese 4-character idioms and its top answer makes me think it might be something special.
Question: How is 由此 used?
I'm seeking just the general idea about how 由此 is used, ideally with some other short examples.  The linked question gives this example

由此可见
yóucǐ kějiàn
from this, it can be seen that ... (dict.cn translation)

It seems to be quite different usage to 由此上楼, however.
由(from)

此(this)

由此 = from this

此 here is an adjective (this),  


  Question: How is 由此 used?


由此 (from this) can be used to modify many different omitted object 

For Example:


由此上楼 = '由此(處)上楼' -  'from this (location) go upstairs'
由此可见 = '由此(事情/ 事实)可见' -  'from this (affair/ fact) we can see'
由此出发 = '由此(地/ 点)出发' - 'set off from this (place/ point)' 
由此终结 = '由此(时)终结' -  'end from this (moment)'