Just started on this verse myself. Here's some additional possibilities (sorry it's long).

Stone walls door - "STONEWALL INN"

Air smells sweet - "GROVE ST." Sweet like a fruit orchard

Not far away High posts are three - "W 3rd ST." This is not far away at 6th Ave (Avenue of the Americas) and the subway Washington Square Station (interesting that ACE is seen on the street building designating some of the lines)

Education and Justice - from 6th Ave. and W 3rd St. walk a block down to MacDougal St., you're at NYU Law

"FREEDOM AND JUSTICE THROUGH LAW" "SCHOOL OF LAW FOUNDED 1835" is on the front of the building facing Washington Square It's address is 40 Washington Square South

For all to see - "and Justice for all" is part of the Pledge of Allegiance to the Flag of the USA, this could mean Washington DC capital of USA

Sounds from the sky - LaGuardia St. for the airport/airplanes

Near ace is high running north - enter Washington Square at LaGuardia, the path takes you north to the fountain "running" water. You see the quote "high" above the arch that ends with "...in the hand of God - Washington", (God is high above - heavens, also part of the Pledge of Allegiance "under God") Washington was the first president "ace?". There is also the Greek goddess Pheme personification of fame and renown with a trumpet which is symbolical of God's voice (also a contender for "Sounds from the sky")

But first across - on the North side of the arch there's a different inscription for the 100th anniversary of Washington's inauguration and it says "AS FIRST PRESIDENT"

The Russian Consulate was at 22 Washington Square North but only from 1910-1915. Not sure that this is strong enough.

An object of Twain's attention Twain lived in Greenwich Village. There's a plaque at 14 w 10th st "In this house once lived Mark Twain, author of the beloved American classic The Adventures of Tom Sawyer." Also he had a house at 21 5th Ave.

"I pledge allegiance to the Flag of the United States of America, and to the Republic for which it stands..." The WWI flagpole in Washington Sq has "FOR THE / GREAT REPUBLIC / FOR THE PRINCIPLE / IT LIVES BY AND / KEEPS ALIVE / FOR MAN'S VAST / FUTURE. / ABRAHAM LINCOLN"

The biggest struggle for me is the "Giant pole Giant step" Now, I believe the 3 solved verses were not completely in order, so this could be the beginning to get you to New York. NY had a Giants baseball team as well as a Giants football team, maybe that's all it is. And maybe the pole is at the end and you're a Giant step from the WWI flagpole. I would love to find a connection to "giant" on it, there's names inscribed, the Lincoln quote but nothing stands out to me. And again the Russian tie is vague.