Lol, if my bike can't stay there then I don't stay there, period. I've never had a job where I had to hide from my boss so can't really speak to the other situation.

Pacific Cycles iF Series - 20" and 26" (they used to also do a 700c, and as mentioned the Reach iF ) all Roll when folded:
https://www.pacific-cycles.com/if

Apparently the OP doesn't want the bike to fold in the middle (top tube),...

I am big into foldies and none of them roll for beans. Lugable, hard to lift due to their bulk and weight, for a feeble old guy like me.
Best thing I have done is emulating the Brompton GOrack ($$ item) with an old collapsing 2 wheel trolley if I have any distance to go.
Heavy (sorta) and inelegant (huh yep), but easy to roll once set up
Foldies are all about compromises, just gotta decide what works in your application,

The more I think of this, the more I am aware of the lack of "universal " rolling, with the idea that it should be like rolling a unicycle around.
Not gonna happen, in more than one maybe two situations, but will "not be too hideous" in others.
Funny are the tales of "concealing" a Brompton in a cover , as an example
Foldies really should be better categorized as Collapsable, lug-able, drag-able , packable, stashable. Roll able on anything other than smooth flooring, not so much.

PS: Agree with linberl below , weight is a big deal once folded. Compactness balances the weight of the Brompton , my Dahons are bulky and feel much heavier than they are at the same weight. the BFsatrday feels 10 lbs heavier than it is, due to bulk. Less than 20 lbs/9kg is good once the hinges are invoked.

The other option is a very light weight fold...my Bike Friday pakiT weighs out at 19lbs (which is a tolerable weight for this 70 y/o female) but if you're willing to spend even more than I did, you can get it down to 15 lbs! At that weight, who cares if it rolls, lol. I've carried purses that weighed more than that, a bag of groceries weighs more, etc. But if you go with a standard folder which typically weighs around 25lbs or more, rolling is a nice feature. No way I would schlep around a Brompton at 26+ pounds, so it's good it can roll. Same with most other folders. Although my Dahon Mu Uno, with a few tweaks by me, is down to 22lbs which isn't awful for a short trip up stairs. And it also rolls ok on two wheels when folded in half.

yeah i'm wondering if i could buy a non-rollable bike and improvise by clipping on some wheels or something.

agreed 100%.

good point.

thanks for sharing, linberl :)
alas, it costs $6000 USD for the 16.5lb version of the Bike Friday Pocket Rocket. out of my budget.
i looked at the Dahon Mu Uno, seems nice! but it folds in the middle, which I don't want. and it is only 1-speed - i've got hilly terrain, I think I need more speeds. thank you!

For $6000, I could hire a porter, or a host of turbaned ruffians, to carry it for me.

Can the Dahon Speed roll when folded? I guess it wouldn't fit the OP's criteria. However, it would probably fit mine.

I'd like to find a list of currently produced bicycles that can roll while folded.

So far I know of:
Brompton.
Dahon Curve.
Birdy

Dahon Vitesse rolls great when folded. Since it's almost the same frame design, I assume Speed does as well. You have to know how to position the magnet and set your steering column.

The only issue I have about rolling my folded Dahons is the magnets will tend to seperate, causing the bikes to open. How to solve the problem? Use velcro, and the bikes remain folded. It's as simple as that.

Maybe think about buying a second hand folder with a great frame. Take the $ saved and throw a boatload of super lite dura ace on it, some super lite new wheels, etc. You can also buy used BF PR; if interested I can provide you with the best forum source. BF also sells just frames so you could build up something on a sweet frame with no hinge that makes you happy. And Bikes Direct has a minivelo you can cannibalize the frame from for a rebuild. There's a big thread here on it. Of course, if you can't or don't like to wrench, none of this is really cost-effective.

Possible Option
 

A possible option that might fit your requirements is the Chedech Folder out of Korea. They have one version with a similar Brompton style rack for rolling while folded, 5 speed internal gear hub & 18 inch wheels for $2650. u.s. & their ultralight version that weighs 15 lbs or so for $3700. Tried to make sense of the various versions but their site is a nightmare to navigate.
http://chedech.com/shopping-mall-3

About as well as the Curve,
which is not to say, well. Wheels are not parallel so you need to tilt one up.
Totally doable but you have to wrestle with it a bit.

That's why I use the hand cart if any real distance needs to be covered

Old thread and I would think the TS has already gotten his/her bike.

Anyway, to clarify on this misconception that the Dahon/Tern type frame fold bikes can't be pushed after fold.
Fact, is, most of them can and in fact they roll better.

I've used/tried both roller based folding bikes (ie. Brompton and Tyrell IVE ) and Dahon/Tern like folding bikes (Crius, Dahon )
Most of them come with a magnet which when properly adjusted, will keep the folded wheels aligned for pushing.
The problem (does not even happen for 16", 14" folders) is that the magnet may not be strong enough to hold the wheels together and may open up when coming up against resistance during pushing (eg. a bumpier curb for example)
This is easily solved with a velcro strap (or even a dis-used inner tube) to secure the wheels together.


The advantage of this type of rolling is that its using the 20" pneumatic wheels (or 14", 16" ) of the bike, hence it rolls over/down curbs, blindman floor markings, gaps between train and platform, etc with ease.
This is opposed to small roller wheels system on Brompton, Birdy, IVE, which chatter a lot over uneven surfaces and need lifting over curbs and gaps.


The only catch to all this is that not all Dahon/Tern like folders are made equal and there may still be some models out there that fold such that the wheels are never parallel to each other.
So the buyer should seek out this information (online ) or at the store before buying.

That's why Tern offers two add-on's:
https://cimg8.ibsrv.net/gimg/bikefor...0e3b371c34.png

It's always good to have a resource of updated information even if the OP has long bought their bike. When looking for features, they may not have been available at the time the question was posted. The Tern BYB could be added to this list but at the asking price in Canada, it would have to be something exceptional. I'm a firm believer that over time any design wiith multiple splits for hinges will develop movement so my preference is for a solid frame with a tuck under wheel such as the Ahooga, Brompton, Chedech & IVE. I'm sure there are others & Ahooga seems to only sell in Europe. All these models can be rolled when folded.