There was also a Halloween Case for City Story last year that they may bring back... here are the stats.
Scary Tree (common) - decoration - 300 happiness (1 space) - Sell for 1000 Coins
Crashed UFO (common) - decoration - 450 happiness (1 space) - Sell for 1500 Coins
Creepy House (common) - residence - 450 population (1 space) - Sell for 1500 Coins
Halloween House (common) - residence - 600 population (1 space) - Sell for 2000 Coins
Pumpkin Patch (uncommon) - business - 750 happiness (4 spaces) - Sell for 2500 Coins
Graveyard (uncommon) - decoration - 900 happiness (4 spaces) - Sell for 3000 Coins
Monster Attack (rare) - business - 1500 happiness (4 spaces) - Sell for 5000 Coins
Haunted Mansion (rare) - residence - 1800 population (4 spaces) - Sell for 6000 Coins
Grim Tower (exceptional) - business - 2880 happiness (4 spaces) - Sell for 9500 Coins