You're contending with some very intractable land use and land economics issues, and effectively addressing them will be very difficult without addressing some

You're contending with some very intractable land use and land economics issues, and effectively addressing them will be very difficult without addressing some of these issues, like preferential access to capital over many other asset classes, preferential terms, preferential tax treatment, preferential infrastructure treatment, etc. This doesn't even start to get into the fact that out of all asset classes, property is an extremely common and popular asset class held and upholds a substantial portion of the wealth of most of the political class around the world. Legislating against property as wealth goes directly against their personal financial interests. Practical solutions that have a hope of actually taking effect within the next 2-3 years must be deployable without the aid of legislation. One way to mitigate speculators is to put up a credible threat that you (the company) wield the ability to unilaterally and virtually overnight make their speculation worthless. If you are able to structure a company town such that it is Google-level amenities and infrastructure attractive and physically entirely self-contained (even water sourcing, water treatment, energy generation, recycling/waste management, schools, parks, restaurants, and retail shops, etc., are part of the company town), then demonstrate the capability to move everything at a moment's notice within a month or two and leave behind just bare foundation ties, then after the first such move that bankrupts the speculators that call the company's bluff, future speculators will find it extraordinarily difficult to secure loans to speculate with. Lots and lots of details I'm leaving out, and this wouldn't be without its problems and challenges, but if you really want to slice the Gordian Knot of high property prices inflating employee compensation, then it will take an outside-the-box action of this magnitude to do so.