Stipulations:
- You cannot die and are immune to disease
- You cannot alter the future such that you change the world from your point of origin. i.e. You cannot become so famous that future people recognize you as immortal.
- If you vary the timeline too much you will cease to exist.
Move to NYC, San Fran or some other place that will be initially growing prior to the Baby Boom. Get settled there and stay there through the forced urban decline until current times. I suspect that I can own multiple properties in that time frame and come out on top when I sell it now.