Singapore in general is probably the best example of what a wealthy urban benevolent dictatorship looks like. Their Single City Gallery (basically their urban planning museum) is a must visit for anyone interested in that sort of thing. Whether that's a desirable or practical model for a US city, I'll leave to others.

Singapore is not a dictatorship by any means. It is listed as a "flawed democracy" by the Economist: the same qualitative rating they give to the United States.

The Singapore government controls all the major press outlets and sues political opponents into bankruptcy. A single party has won every election since independence. The US has flaws, but in a completely different way from Singapore.