Entertaining skilled extraordinaire, Rebecca Gardner recently debuted her newest creative idea, the Sugarplum Pop-Up on the St. Regis resort in New York. There was a time, a couple of decades in the past, when the price of living didn’t fluctuate all that much from metropolis to metropolis. Since then, as places like New York, San Francisco and Seattle have been hit with skyrocketing rents and residential costs, the regional disparity in housing costs has altered how People of different incomes pursue alternative. We might nonetheless see homes of different sizes and types — condos in some locations, single-family homes in others — depending on the market in each city. A…