Q: A one-bedroom condo apartment in Manhattan has an asking price of $399,000, needs significant renovation and has a $1,941 monthly common charge. Two other apartments in the building are also for sale; they’re comparable in size, on a higher floor, have already been renovated, have asking prices of $620,000 or more — and yet have lower common charges of about $1,750. Why the discrepancy? And what goes into calculating common charges?     Read the Q&A………………………………..