I have rewritten your letter using your English (not your Japanese). I work in an architectural office and edit things all the time. I have restructured your letter so it has a more logical order.
P.S. are you looking for a position at KCAP?
Dear Mr. AAAAAAAA
I am writing to you regarding a position at your studio at the suggestion of my friend (please put your friend's name if it is a 紹介, otherwise delete "at the suggestion of my friend"), hoping that you may be looking for talented foreign architects.
I am a 00 year old Japanese man with over three years of experience in architecture design offices. I was working in Shanghai previously, pursuing big landscape and design projects in China. I have developed a keen interest in the problems of urban gentrification occurring in many of the world's cities and I hope to learn professional architectural design and the latest European solutions for the problem of gentrification at your studio. My experience has provided me with a broad and unique vision for the design field and I hope to be able to employ my skills at your studio.
I graduated from BBBBBBB, which is Japan's most famous national Art University. I worked at CCCCCCC in China for 4 years. CCCCCCC is the no. 2 architectural design firm in Japan (world 23rd). I have also worked at the American DDDDDDD Group in Shanghai. As you can see, I am accustomed to working internationally, and am conversant in both English and Chinese. I have designed various big urban developments, as well as libraries, sales offices, etc,.
I am currently staying in Amsterdam and plan to be here for 10 days. Although we have not had any communication before, I hope you will look favourably upon my letter. I look forward to the opportunity to discuss this with you in person. I am certain that my experiences and abilities, which are listed in the attached files, would be able to contribute to your projects. I look forward to your favorable reply and the opportunity to discuss with you personally. Thank you in advance for your time and consideration.
Yours sincerely, XXXXXXXXXX XXXXXXXXXXX