Hard disagree. Rational investors have no problem whatsoever projecting the impact to future cash flows and adjusting the amount they're willing to pay now. That's like saying the stock market wouldn't respond quickly to changes in next year's tax law.
And these things have a lead time of years
That's not accounting for the time value of money.
Suppose you have a rental unit and before rent control you were planning to rent it out. That now has far less attractive returns and it suddenly makes more sense to sell it as a condo to an occupant rather than keeping it to rent it out. Likewise, other prospective landlords no longer want to buy it at the previous market price (returns went down and they can invest in stocks or housing in some other city instead), so the short-term effect is to increase the number of property sellers and decrease the number of buyers. Short-term, property values going down is the expected thing.
But construction going down is also the expected thing, for the same reason. If property values are lower then the number of viable construction projects is lower and less construction happens.
The lack of construction then continues until rents, even after rent control, are high enough to justify more construction, i.e. are even higher than they were originally, because now to justify the same investment as before you need the current rent to be high enough to account for the inability to increase it later. And with less construction happening, that's the natural result in a growing area. More people have to bid on the same number of units, rents go up. So the short-term effect is lower real estate prices, the long-term effect is higher.
Now you say, if we expect real estate costs to be higher later, why don't investors take advantage? Which is the "time value of money" issue. If you invest there now because the prices will be high later, what do you do with the property in the meantime? If you don't rent it out, paying $1 today to get $1 in ten or twenty years is dumb, so you only buy if the current price is at a discount. If you do rent it out, then you'd be stuck trying to sell a building with a rent-controlled tenant, which isn't worth as much as the same building as empty as you bought it which you could sell as condos or rent out at current rents instead of price controlled ones, and then you still need a discount. And so the current seller has to provide a discount even if the real estate costs will be higher in a few years.
There's no reason to believe that construction companies would accept jobs at prices below the cost of materials and labor. Construction companies frequently let workers go rather than accept large negative cash flows.
Who's talking about cost of material and labor though?
Not only construction companies make good money, but the price of the land is a significant part of housing cost. And this price is entirely driven by the value of the real estate that will sit on it.
You cannot repeal that law, though they try again and again and again.
Markets can remain irrational much longer than you can remain solvent.
He flirted with bankruptcy multiple times.
It might not happen that way - someone does need to check - but at 9 months I wouldn't read much in to this study. The physical market would still be reorganising and it seems entirely possible that the eventual impacts are just different than what this study suggests. I'd want a period of more like 5 years to be confident that the data had given everyone in the market enough time to feel the impacts of artificially low rents and reposition appropriately.
Lot of different ways to say you don't know anything at all. This isn't a new market. This isn't the first time laws have changed in this way. This isn't the first time they've had this effect. We already know all of this. You're just waffling and enjoying the sound of your own voice.
Starting with the assumption that all or even most investors / actors are rational is a continuing pox on both economic scholarship and societal thinking