Unfortunately the rate of bike theft is so high that even with the best locks, if its left in view of the public, its going to be stolen.
The best place is one:
* which is not visible from the street
* still has some public traffic (aka "someone could exit the building at any time")
* the bikes next to yours are worse protected than yours
I am faring quite well with this strategy for 10 years now and haven't had a single bike stolen from me despite using the bike as my main mode of transportation. In the same time my collegues had theirs stolen roughly every 2 years.
The worst place is one:
* which people pass by alone
* which is still somewhat visible from the street
* where your bike is the only one there