How should I address this on a cover letter and envelope?

Question

I'm applying for a job at Webster University in Saint Louis, Missouri, and here are the instructions on their website: "Please submit cover letter and resume to Human Resources, Re: Administrative Associate-Holden Public Policy Forum, Webster University, 470 E. Lockwood Ave., St. Louis, MO 63119 or email to [e-mail]."

So, is the address on the cover letter supposed to look like this?

Human Resources

Re: Administrative Assistant-Holden Public Policy Forum

Webster University

470 E. Lockwood Ave.

St. Louis, MO 63119

Should I address them like this: "Dear Human Resources"?

Answer 1

should be:

Human Resources

Administrative Assistant-Holden Public Policy Forum

Webster University

470 E. Lockwood Ave.

St. Louis, MO 63119

Dear Sir or Ma'am OR To Whom It May Concern

GOOD LUCK!

Answer 2

Ouch! It's a nasty one. I sympathise.

Working in theatre and film I've had a few of those - the answer for me was to phone their agent or PA and ask nicely how they prefer to be addressed. I got several jobs and quite a few dates with gorgeous PAs.

Answer 3

The address is fine.

I would address the leter to  "Dear Sir or Madam"

Or call Webster and ask who is the HR manager and address it directly to that person.