I shall b brief and precise. 

Documents required: 
A) Dependent's original passport
B) Copy of Federal returns filing 
C) W-7 form 
D) Print out of the first and last page of dependent's passport, Visa page. 

The nearest office that does in-person verification is in Indianapolis. It opens at 8:30 am. Try and make it as early as possible. We were there at 8:30 sharp yet there were 15 people ahead in the line. They will give u a token number. Once they call out, submit all documents. The entire procedure takes about 15-20 mins ( excluding waiting time). I got my passport immediately after verification. She informed that I will get my ITIN in 10 weeks and the refund 2 weeks thereafter. 

We filed our federal returns on turbotax. When an error occurs askn for SSN for dependent, go ahead and print without it. 

PS: Roadside parking options are available on Pennsylvania ave itself. Cash/credit card. Or there is also a garage within 0.5 miles. 

Check below link for address and office hrs. 
Good luck! 
http://www.irs.gov/uac/Contact-My-Local-Office-in-Indiana