The price will increase no mater what you do so long as you rely on an uncontrolled free market in real-estate.

At some point prices will make employing people there impracticable due to wages and commercial rental. In the current system, that is the price point the market will reach no mater how many units are built.

Building isn't the main difference between SF and NY. If everyone in Brooklyn want to live in Manhattan prices would be very different.

If anything SF has become more centralized and companies keep paying high salaries and other perks playing in to the whole thing.