Start out on the right foot and don't create a problem when there isn't one yet. 

The first building will be a 458,018-square-foot facility with space for quantum computing and cryogenic equipment.

Cost per square foot X square feet = construction cost per unit.

The 3,250-square-foot rink opens on November 17 and runs Thursdays through Sundays, offering skating sessions for $20 an hour or $75 for the day.

Here’s an example of what I’m talking about; in 2020 my partner and I purchased a 9,965 square foot office/warehouse which had just been vacated by the tenant, for $625,000.  

So, as a rule of thumb they might be considered at half the value per square foot as above ground space.

Same as @John Underwood, @Diaz Principe Nicolas.I would love to get more off season bookings but there ins't much call for a iced in lake house with a foot of snow on the ground and the lake being frozen over.It is fun to see how many turkeys end up on the deck and to watch if wolves use the frozen lake to move around.

In this approach, the taxpayer calculated that the cost to construct a new building (say, $300 per square foot at 2,000 square feet, totaling $600,000) should be allocated to building and the remaining balance of the acquisition should be allocated to land.Rule of thumb method: Some taxpayers use a predetermined percentage (such as 80/20 percent, 70/30 percent, etc.) for improvements and land.

Conservatively estimating new construction costs as $300/sq foot, the new duplexes could cost about $600,000 each to build (plus interest costs).

Most building codes by nature will not approve a home that small, most have minimum square foot requirements.