I cannot figure a meaning to this.
I suppose he wants "real estate" in his keyword, in which case it is worth 0, as you can find much better other things to add to "real estate" than appending "en", especially to the end of it.
When you first see it, seems like "realestateteen" but you read more closely and realize that's not what it says.
It's either a typo, or the case I mentioned above, and in that case worth 0, or it means something in a foreign language and in that case I can't say, because I don't know what it means.
It's a good idea to include as much info as you can when asking for a domain appraisal..
