WASHINGTON--(BUSINESS WIRE)--Consumer demand for rental apartments remained strong while the market for apartment properties stayed relatively unchanged in the latest National Multifamily Housing Council (NMHC) Quarterly Survey of Apartment Market Conditions. The market tightness, sales volume and equity finance indexes all remained near or above the breakeven level of 50, while the debt-financing index fell to 35. For the survey’s special question, only 15 percent of respondents indicated that