Why are the listing prices so low for these properties

[Dave Ba]

Hi all. I just starting browsing for a Florida property in the West Palm Beach area to see what I can find. The list prices of these properties appear to be quite low, but I can't see any justification for this under the listing details. I imagine that there is some catch and appreciate any info as well as any other general things that I should be watching out for in general listings for prices that appear to good to be true. Thanks! 

https://www.zillow.com/homedetails/8160-Sandpiper-Way-West-Palm-Beach-FL-33412/46917313_zpid/

https://www.zillow.com/homedetails/7637-Iris-Ct-West-Palm-Beach-FL-33412/46917684_zpid/