Doesn't look much valuable since these extension only have limited sales with one or two words.
However, .online is still better than most.
You might try approaching ApartmentRental**** buyers using Namebio and see if they are interested.
Less chance of selling but still worth the try.
If you wish to hold this one, I believe it won't fetch much.
The buyers may want to go with other similar names if they go for spending good money. Hence, 3 figures if you sell this.