Liberty Media Chairman John Malone recently told CNBC that hard assets look attractive as the unprecedented coronavirus stimulus is poised to lead to a depreciation in currencies.
Hard assets such as housing is viewe...

That would tend to drive real estate appreciation, and/or currency devaluation relative to real estate (inflation) up.

What devaluation can you take on your home, if your extended on loans? 

Does this devalue my historic home?

The issue with RV’s is, if they are allowed, many people will have old junk sitting around & it devalues the neighborhood for others.

You are doing two things wrong, first you are devaluing your property by not charging market rents, value being based on income, and second you are risking legal action in the event of a injury.

There are many many things to play with but I was wondering if anyone has deliberately devalued their investment property before?

However, it is unlikely that these failures will result in a systemic devaluation of the market. 

If you want to keep track of the economic trends that impact local RE values, there's no better nor more pessimistic news outlet than Seattle Bubble, which is constantly scanning for signs of price devaluation and parses the factors down to the DNA level.

They perceive a threat  to quality of life, house values, and increased crime and devaluing a quality area.