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jrussino commented on Why do commercial spaces sit vacant?   archive.strongtowns.org/j... · Posted by u/NaOH
toast0 · 6 days ago
> Interesting, but It doesn't answer why a bank would hold a completely vacant building for 15 years.

Lowering the rent to fill their building reduces the value of that building, which means when they sell it, they will recognize a loss that is likely larger than many years of operating loss from the empty building.

Additionally, lowering the rent for that building will also reduces the value of other nearby buildings that have that building as a comparable property. Then when those buildings come up for refinance, either the borrower will have to come up with more funds so that the loan to value max isn't exceeded or the borrower will default and the bank will lose the income stream and be holding another property where their investment is more than the value.

Borrowers usually don't want to come up with more funds on a property where they're underwater and banks don't want to foreclose on property where the bank will be underwater, so it's in the bank's interest to let things be vacant and keep the valuations based on the previous rent, rather than lowering the rent and facing the music. You'll also see promos like first several months free, rather than reducing the rent, so you can report it's rented at whatever the headline rate is, even if the tenant is effectively paying much less; of course, the tenant will be looking for somewhere else to rent come renewal.

This is far from the only case in banking where taking some action on an asset that would otherwise be reasonable won't be done, because it would trigger a mark to market on too many other assets. Ex: you can't sell realize a loss to sell treasury bonds to satisfy cash flow needs, because you'll have to mark to market all the similar bonds, and then you won't meet your reserve needs.

jrussino · 5 days ago
> Lowering the rent to fill their building reduces the value of that building

This must just indicate that the model used to value the building is wrong, right?

I'd think insofar the value of the building is tied to the rental price, that value should naturally be a function of the revenue that the building can be expected to generate, which in turn is be a function not only of the chosen rent price but the likelihood of someone renting at that price. Why would a building that offers its units at $N per unit but can only fill half of them at that price be worth more than the same building filling all of its units at $N/2 per unit?

I suppose there's some wiggle room to account for the relative uncertainty in those two cases. But fundamentally the rental price is a choice whereas the value of the building is (or ought to be) based on a combination of the qualities of the property itself and what the market is willing to bear.

jrussino commented on The Math Legend Who Just Left Academia–For an AI Startup Run by a 24-Year-Old   wsj.com/tech/ai/math-ken-... · Posted by u/pondsider
charlieyu1 · 19 days ago
It’s almost like tech world pays more and has less bullshit than academia
jrussino · 19 days ago
> pays more

Definitely

> has less bullshit

Is there a Theranos equivalent in the world of math research? I'd argue "very different flavor of bullshit", but not necessarily less of it.

jrussino commented on Amazon faces FAA probe after delivery drone snaps internet cable in Texas   cnbc.com/2025/11/25/amazo... · Posted by u/jonathanzufi
cesarb · 21 days ago
> Traditional stereo won't help you localize them [...] and LIDAR sacrifices resolution for weight and power consumption

I wonder if a more mechanical solution wouldn't help:

Whiskers, like on a cat. A long enough set of thin lightweight whiskers could touch the wire before the propellers do, giving time for the drone to stop and change course. Essentially, giving the drone a sense of touch.

jrussino · 21 days ago
As an undergrad I worked with a professor who was doing precisely that! https://sense-lab.github.io/pubs/pdf/solomon_nature_2006.pdf

I hadn't thought about this in a long time. Looks like her lab is still going strong doing research at the intersection of biology and robotics on whisker-based sensing:

https://sense-lab.github.io/robotics.html

https://sense-lab.github.io/publications.html

jrussino commented on 'Calvin and Hobbes' at 40   npr.org/2025/11/18/nx-s1-... · Posted by u/mooreds
throwworhtthrow · a month ago
Try the PBS Kids app. The shows are consistently cast with good role-model children and adults, without being preachy. Many episodes show how to resolve mistakes, frustration, and conflict in beneficial ways.

In comparison, the behavior in the kids shows from other producers (Disney, Nickelodeon, etc.) sometimes presents nasty behavior and name-calling as either inevitable, or something that's "someone else's problem": the instigator, if they're punished at all, might suffer the wrath of an authority figure, or simply bad karma.

My intent when choosing shows is not to hide the existence of bad behavior from children, but to teach them how to deal with it.

(My children also read Calvin and Hobbes. And watch those less-wholesome shows. And binge-watch MrBeast when I'm not around...)

jrussino · a month ago
> Try the PBS Kids app

Great recommendation. Angela Collier has a recent piece on kids' television and PBS in particular that is worth a watch: https://www.youtube.com/watch%3Fv%3DGyatqN63RZ4

jrussino commented on The last-ever penny will be minted today in Philadelphia   cnn.com/2025/11/12/busine... · Posted by u/andrewl
Night_Thastus · a month ago
I'd say screw it, get rid of nickles and dimes as well. Quarters can stay, for now.

It's a complete waste of money and time continuing to mint such low-value currency. It can't be used for just about anything.

Unfortunately, I do see the problem with part of this. For a handful of items where it does matter, it will force people to use cards more if they want to avoid rounding. And the card providers already have a choke-hold on retailers, and the whole thing is basically a scheme that funnels money from the poor to the wealthy via interest and fees on the consumer, interchange fees, and rewards programs.

jrussino · a month ago
> Quarters can stay, for now.

I'd say just drop the second decimal place and have dimes and half-dollar coins.

jrussino commented on Gold Prices Top $4k for First Time   wsj.com/finance/commoditi... · Posted by u/thm
otterley · 3 months ago
I've been long on gold since Trump started going crazy with tariffs. You can't tax imports without having its effects percolate throughout the economy eventually. I'm also reacting to what I think is a growing AI asset bubble that will pop at some point (it's not a question of if but when).

Most of my savings was in SPX (S&P 500 ETF), but over the course of the year I've been progressively exchanging more of it for GLD (ETF).

It's been a good strategy for me so far.

jrussino · 3 months ago
> I've been progressively exchanging

Is there a way for a small individual investor to "exchange" shares in stock without doing a "sell A + buy B" for which the sale of A is subject to capital gains tax?

Some cursory googling points me to "exchange funds", but those seem to be designed for accredited investors.

The advice I see for someone like me who wants to "re-balance" is just to change allocations for any new investments, but I'm wondering if there's an effective way to shift existing allocations without incurring a tax penalty...

jrussino commented on Show HN: The Little Book of Maths for LLMs-The maths you need to understand LLMs   little-book-of.github.io/... · Posted by u/tamnd
tamnd · 3 months ago
@jrussino Would you like EPUB or PDF versions of just the tale? I can prepare them for you.
jrussino · 3 months ago
I've been reading them on my phone; the web interface is OK, but if you had an EPUB I would certainly prefer that. Thanks!
jrussino commented on Show HN: The Little Book of Maths for LLMs-The maths you need to understand LLMs   little-book-of.github.io/... · Posted by u/tamnd
jrussino · 3 months ago
I stumbled into this "tales" section:

https://little-book-of.github.io/maths/books/en-US/tales.htm...

I started reading it to my elementary-aged kids as a bedtime story! We're only on part 7/100, and I suspect we'll be too deep for them before long, but at least or now they're really enjoying it.

Deleted Comment

jrussino commented on Nine things I learned in ninety years   edwardpackard.com/wp-cont... · Posted by u/coderintherye
bdangubic · 3 months ago
> If we make choices based on not just what's best for ourselves but what's best for all of us, we will all suddenly become more "lucky".

I personally know handful of extremely lucky people who spent their entire lives doing the exact opposite of this

jrussino · 3 months ago
I think the point is that this only works in the aggregate. Individuals in a group/organization/society can make small positive decisions that improve the likelihood that any individual in that same group will get "lucky".

There's a sort of "freeloader" problem, though, which is that the ones who get "lucky" don't themselves have to be making positive choices. In fact, being a selfish individual in a group of generous ones can be an easy way to get ahead - as long as you can get away with it without being noticed or punished.

u/jrussino

KarmaCake day796April 1, 2009
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