[Sciencewoman]

^^^ I think there's another reason why the financial obligation of maintaining a sorority headquarters is difficult, compared to large, old fraternities like Sigma Nu. I would hazard a guess that many fraternities have received significantly higher donation revenue through the years than most sororities, due to gender disparities in the workforce, income, financial control of household finances and discretionary spending, etc. I've wondered about that over the years, because it just seems logical that there would be a gap. For many decades, there wouldn't have been as many women who had the income levels or access to discretionary funds that would allow them to make significant contributions to capital campaigns.

In other words, scroll through the notable alumni on some fraternity sites, and compare that to the notable alumnae on sorority sites. Lots more CEOs, etc. among the men = lots more money to donate = paid off facilities.