Holiday House, Villa
noun
A villa separate from your normal house is a holiday house. You go there when you're sick of your normal house to relax.
べっそう
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
この春に別荘を売ってしまうつもりです。
I plan on selling the villa in spring.