Definitely this would be a bad choice.
#1, the prices are in the mid 400s to low 500s. Add a few upgrades and you are definitely in the low to mid 500s. There are new detached homes essentially just 50k more within del sur. There have been some larger mid 2000 sqft homes from kensington resale around mid to high 500s.
#2, the number of distressed homes within del sur should be very high, which means those bigger sfr homes sold back during the peak will continue to come on to the market essentially at a price point just slightly higher than condo pricing of mandolin. Which means more downward pressure on price.
#3, del sur unfortunately has THE highest MR in the entire county. Which means you really have to score a fantastic purchase price to make mandolin make sense.

For the similar price point of 500k. You can score a resale sfr in SEH.