Hawaii Living's website includes the following statement in its description of the Twin Towers Condominiums in Waikiki:
"This is where McGarrett lived in the original 'Hawaii Five-0'." *
The address is 2085 and 2089 Ala Wai Boulevard. McGarrett lived at 2085. We saw exterior shots in Part 2 of the "'V' for Vashon" trilogy (Season 5).
To see interior pictures, both as the units originally appeared and as they have been updated through the years, google "Twin Towers Waikiki" and go to "images."
Today, the units range in price from about $450,000 to about $550,000; however, it is interesting to note that no units currently are on the market! It's easy to see why. The views of the Ala Wai and the Koolau are gorgeous, it's within walking distance of the beach, and the units are nicely sized and arranged.