Obtained 3 year TN visa at Buffalo

You can renew your TN-1 for up to three years at a border crossing, all the new regulation basically does is replace the words "a year" with "three years", so provided your employment letter says three years and they believe you have non-immigrant intent, there is no change in the application or renewal process.

If the guy at the POE mentioned a form to use to renew it in the US, he's talking about I-129, however generally speaking you're better off applying for renewal at a POE for several reasons:

1) You're there to answer their questions and clarify any information they're uncertain about;
2) It's faster;
3) It's much cheaper, $50 as opposed to $320;
4) It's simpler, because you (or rather your employer) don't have to fill out I-129 which is quite complex.

The only reason to do it by mail really is if it would cause you a huge problem to go to the POE, but even cost-wise, it may cost you less than $270 to get to a POE and back anyway. You can probably drive the entire width of the 48 contiguous States on $270 with the current price of gas!

Thank Steve for your info.

I was at border on Dec 27 and an officer refused to renew my visa for 3 years even though on a letter from a company requested for 3 years extension. May be the rule is new and he is uncertain about it so played safe by renew only one year for me. I wonder does I-192 is same as TN-94? It is a long distance for me to go to border to renew visa. I rather pay 320 than have to drive all the way there. Actually my company pay for that so it is better that way.

Thanks

The rule has been in force since October 16th so he should be aware of it.

I think you're getting your forms mixed up, I-129 is used for extending your stay by your employer if they file while you are still in the US. The I-94 is the permit you get.

I want to ask the expert because I am going to apply for TN visa soon. What specifically should be contained in the said letter (employer's letter)? Since it is my first time, I need some advice, thanks

If you want specifics:

(ii) Documentation demonstrating engagement in business activities at a professional level and demonstrating professional qualifications. The applicant must present documentation sufficient to satisfy the consular officer (in the case of a Mexican citizen) or the Department officer (in the case of a Canadian citizen) that the applicant is seeking entry to the United States to engage in business activities for a United States employer(s) or entity(ies) at a professional level, and that the applicant meets the criteria to perform at such a professional level. This documentation may be in the form of a letter from the prospective employer(s) in the United States or from the foreign employer, and must be supported by diplomas, degrees or membership in a professional organization. Degrees received by the applicant from an educational institution not located within Canada, Mexico, or the United States must be accompanied by an evaluation by a reliable credentials evaluation service which specializes in evaluating foreign educational credentials. The documentation shall fully affirm:

(A) The Appendix 1603.D.1 profession of the applicant;

(B) A description of the professional activities, including a brief summary of daily job duties, if appropriate, in which the applicant will engage in for the United States employer/entity;

(C) The anticipated length of stay;

(D) The educational qualifications or appropriate credentials which demonstrate that the Canadian or Mexican citizen has professional level status; and

(E) The arrangements for remuneration for services to be rendered.