What early construction flaws do to your long-term ROI

My portfolio review shows some Gurugram properties aren't performing as expected. Looking at Signature Global City Phase 1 for a new investment. Construction quality ka kya haal hai? Does poor build quality, like early seepage, really drag down resale value and inflate maintenance costs over 5-7 years? Also, full power backup milta hai ya just common areas? Yeh cheezein tenant attraction aur long-term ROI pe kitna impact karti hain? Real-world data ya experience chahiye.