I'm so tired

I'm so tired.. because I inspect the equipment and Cclean the office too late..:-(
But I'm feel so really good to when I see the office of cleanliness. all clean!

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I'm so tired because I have to stay late at the office to inspect the equipment and clean. :(

On the bright side, I feel good seeing the office clean. 

I'm so tired

I'm so tired because I had to inspect the equipment and clean office until late in the evening...:-(

I'm so tired because we had to inspect the equipment and clean office until late in the evening.

Some options for the second sentence

But it felt so good to see the office clean.

But it felt great to see the office clean.

But it felt so good when I saw that the office was cleaned up.
But it felt so good when the office was cleaned up.

But it felt so good that the office was cleaned up.

언어선택이 한국어밖에 안되네요?
어떻게 영어로 바꿀 수 있죠?