L1A to EB1 GC after 3 years of tenure in US

[Minu]

I am working on L1 A and I have completed 4 years of work in US on L1A Visa. I am continuing in US  on L1A visa which is valis till 2019 Aug and it ican be extended till 2021.Can EB1 green card process be intiated for me as I have completed 3 years in US on L! A visa. I have read in the website ("http://www.immi-usa.com/eb1c-green-card/" )  which states as below: 

   "This is because one of the requirements for the EB-1C is that you must have worked at the multinational company’s foreign branch for at least one year in the three years leading up to the EB-1C petition. If you have spent the last three to seven years in the U.S. under L-1A status, you will be ineligible for an EB-1C until you travel back to your home country and work for the foreign branch for at least a year. "  

Is there any legal way, in which I can apply for Eb1C in this situation?

[K2M]

you can file on eb-1c if you have not switched company in USA.  The three year in which you have to work for company abroad is basically the three year prior to entering USA.   Since you are already on L1A, I assume you satisfy EB-1C managerial role requirement. Below link provides more details.

https://www.murthy.com/2018/05/10/aao-on-one-in-three-rule-for-eb1c-multinational-managers-executives/