Hi and thanks for contributing to OSM!
I checked and the building still appears on all recent aerial imagery. I guess what makes it confusing is that it is split into several building parts with different heights.
I think the easiest way for you to add a new business would be to create a new point and mark it as a new restaurant.. etc. That way you don't need to deal with complicated buildings or drawing new building outlines.
Cheers
Mashin

Hi,
there are several things that are wrong with your edits.
1) Please don't delte existing objects to replace them with a new version. You can drag the nodes/points of the old shape to adjust the accuracy.
2) Don't create "lollipop extensions" like you did here: way/109463818
If there is a bunker in the fairway you have to use "multipolygon".

You can get more information by reading these pages:
leisure=golf_course#Common_mapping_pitfalls
osm.wiki/Multipolygon_Examples

Please, don't delete existing objects. If you need to change their shape then drag their nodes to new positions.

Hi.
When drawing greens and fairways please don't create overlaps between the areas. Please see here for more details: leisure=golf_course#Common_mapping_pitfalls

No problem. Things like this just happen.
Cheers
Mashin

hi, thanks for working on OSM, but those are not railway crossings. Railway leads on a bridge over the road so those two never physically meet.

Please do not retag building outlines as `building:parts` in order to hide them from your golf app.

Hi, No Trespassing sign is not a reason for removing a road. In such cases we add 'access=private' tag.

Hi and thanks for contributing to OSM, but has the road beed completely removed? It is clearly visible on aerial imagery.

Hi,
thanks for your good work, but before you do further road classification changes in CT, would you mind contacting jnighan and consulting wiki?
osm.wiki/Connecticut/Highway_classification

Recently all roads were tidied up and so let's be careful to not make a mess out of it again. Thanks

It seems that wiki suggests using "lane_markings=no". I don't know if "lanes=1" is appropriate in this case. (lanes=*)

To denote that someone is maintaining the road and you also have their name you can use "operator=xyz". In some cases some folks also add "access=permissive" tag.

Hi, though driveways are more or less those short paved strips that lead from Handel Court to a particular garage/house. This is more of a residential road with a purpose to provide an access to houses.

Hi, you accidentally removed building=yes tag.
I went ahead and fixed that.

Hi, could you please provide mor information about the building? Is this some sort of company? There are several buildings around that are named ASML. Does the '(50)' signify anything?
Thanks

Looks good, thanks!

One tip for you, you can press Q to force all angles to 90˚. Buildings then look nicer.

Looks good. Thanks!

Hi and welcome to OSM!
What are you trying to achieve? `man_made=beacon` that you used is meant for signal towers, which i suspect is not what you meant.
man_made=beacon

Also you seemed to have moved an address from one of the houses onto a road node/8850609511

Thanks for contributing! Do you know what kind of business this is (restaurant, fast food,..)? Name is not sufficient to find it.

When it comes to ownership of the roads one can add "operator=XYZ condo complex" tag to the roads that are maintained by a certain private entity.
But as far as I know, in CT the sign "private" does not automatically mean public access is denied. There needs to be either "No Trespassing" sign or a physical barrier like gate, ramp, etc. preventing the public entry. Without those, some people add "access=permissive" to indicate that it's not a public road, but the use is tolerated.

There have been a few discussions about this on OSMUS Slack where you can poke around if you want.
https://osmus.slack.com/archives/C2VJAJCS0/p1614528863267000

Hi and thanks for contributing to OSM! Though, these roads were correctly classified as residential as they serve as an access to residential buildings.
Also we mark roads as private only if they have a "no trespassing" sign or a gate that prevents entering the road.
Let me know if I can be of any help.