[identity profile] pete stevens (from livejournal.com) 2012-05-18 02:00 pm (UTC)(link)
It's worse than that. Suppose you've paid $x to buy enough land to build $n houses that will sell for $y each and have a building cost of $z each. Your profit is $n($y) - $n($z) - $x. Your land is valued at $x/$n.

Now if you go and sell one house under price at $y-$d, your profit is now.

$n($y -$d -$z) - $x.

More importantly your land is now valued per plot at

$x/$n - $d.

because the act of selling one house revalues all of them.

If this is less than the outstanding loan or the conditions on the loan you've just defaulted and your land gets repossessed and all the penalty terms will destroy your business. So a sane plan is to leave the land empty and hope the price rises enough before you run out of money paying the interest.

This is why builders will do anything to get the value listed in the land registry as the list price of the house, even if it involves a special mortgage which happens to be interest free for the first 20 years and the free deposit comes out of the marketing budget and definitely doesn't revalue the land.