Thank you all so much for the valuable input and sorry for answering that late. I was quite busy working.
I read so much about photography lately and I really wonder why I didn't come up with the exposure thing myself.
You really opened my eyes. Took a test shot the other day. Free handed, only a single shot. Exposure isn't perfect but I'm really happy with the result because at least, it's definitely not dull!
I'm really eager to take my tripod and make multiple exposures for both the sky and the buildings.
Again - thank you very much. You're all life savers.