I would be thankful if they created a day-care at our workplace.
I would really appreciate it if the company I work for could start a nursery there.
この場合、次のような言い方ができますよ。
ーI would be thankful if they created a day-care at our workplace.
「職場に託児所を作ってくれたらありがたいのに」
I would be thankful if ... で「…ならありがたい」と言えます。
to create a day-care で「託児所を作る」
ーI would really appreciate it if the company I work for could start a nursery there.
「私の働く会社が（会社に）託児所を作ってくれたらとてもありがたいのに」
I would really appreciate it if ... で「…ならありがたい」とも言えます。
to start a nursery で「託児所を始める」
ご参考まで！
カナダ 
