How many sqm are the semis on? Is it a regular share, or irregular?
If they are on <1000sqm total you'll have a long while to go for prices in the market to recover, though if you have a *large* allotment the prices are creeping upwards towards 300k again.
As to whether to cut your losses or not, depends on your strategy moving forward. I'd take a guess that even at the price you paid, they would be CF neutral/positive. Taking a hit and not having an cash on exit wouldn't make it very attractive, unless there was ongoing holding costs eating away at the investment.