My assumption is, there is no capital gain on sale of asset.
So, this cannot be considered under CG accounting is what I believe.
But, if the house is revalued, and, I am not sure about measurement of private properties, if the revaluation amount is more than it’s book value, then you have a capital gain.
I just happened to go through this article which mentions that business losses can be set off against any other income, so, technically, if you have a revaluation gain on sale of your property, you can set off the business loss and hence, one will get exemption because setting off against non-tax exempt gains is possible it seems. Contact your auditor for further details.
One more thing, CG tax exemption is prevalent for three years from the date you sell your home. Maybe, you have to wait till that period and then clear off your business loss.