That seems risky given that Bitcoin prices fluctuate and it appears to be really out of favor currently. 

Id always though the number of $1m and over earners fluctuated between 30,000 and 50,000?

Even if you were to buy at the peak of the market and suddenly housing prices dipped 20%, if you had planned to buy long-term, then short-term fluctuations should not concern you.

Refinance the property, buy muni bonds with the proceeds, and get a line of credit against the bonds...form of infinite banking.https://www.biggerpockets.com/forums/50/topics/629...FYI...the equity can't be "saved"...it will fluctuate with the market.

If you're buying retail and holding, you're more susceptible to market fluctuations.

Prior to this we had 2 – 3 years of real property price increases of 1 – 2 %, and so it has fluctuated for the past 9 years.

Unexpected Challenges: - Besides contractors, be prepared for unexpected issues like permit delays, fluctuating material costs, or unforeseen structural problems.

this "appreciation" that happens on the coast is really just market fluctuation.  

In all of those areas (malden, everett, revere, dorchester etc) you are probably looking at around pretty decent shape 2 bed condo, though obviously this can fluctuate quite a bit depending on area and inventory. 

This allows the us to optimize solar heat gain, R-value, and visible light to leverage the benefits of the sun in winter, but avoid overheating in summer and to mitigate temperature fluctuation in the living space as a consequence of time of day or season.