Private property in land is pretty much the definition of a government-created privilege, so the government does plenty of "obstructing" when it comes to people's right to shelter. The governments which originally granted those monopoly rights on land many centuries ago had no inherent authority to do so-- although they may have had authority to lease the use of that land for some limited time, under fair and non-discriminatory rules. (This is how land is managed e.g. in Hong Kong and Singapore, and the system works quite well.)