The Nassau County house you didn’t buy in 1983
A $300,000 house at 1983’s average index level, tracked to 2026 Q2.
The metro index went from 47.3 (the 1983 average) to 510.4 in 2026 Q2, 11× its 1983 level. That makes a $300,000 purchase about $3.24M today.
With 20% down ($60,000) and a 30-year loan at 1983’s average rate of 13.23%, today’s equity is about $3.24M, 54× the down payment. The loan would be paid off by now, so the equity equals the house’s value.
The S&P 500 index fund this site compares against (the TSP C Fund) begins in 1988, so there is no market comparison for a purchase before then.
Run your own numbers for 1983 →
House figures are estimates for the whole metro market, from the FHFA index. Not financial advice.
FAQ
What is a 1983 Nassau County house worth today?
About $3.24M for a $300,000 house, a 11× market multiple to 2026 Q2 by the FHFA all-transactions index for Nassau County-Suffolk County, NY.
Why use an index instead of listings?
The FHFA index is built from repeat transactions on the same homes, so it controls for the mix of what happens to be for sale.
Is this investment advice?
No. This is historical arithmetic for education and entertainment.