I assumed that's why all the extra "buildings" were created. If you look at these links, you can see the 3D work in Denver I created: Union Station: https://demo.f4map.com/#lat=39.7533276&lon=-105.0004084&zoom=20&camera.theta=67.345&camera.phi=20.283
3D Denver Art Museum: https://demo.f4map.com/#lat=39.7375104&lon=-104.9881734&zoom=20&camera.theta=67.681&camera.phi=-21.966
3D Denver Greek Theater: http://demo.f4map.com/#lat=39.7381045&lon=-104.9888202&zoom=21&camera.theta=72.502&camera.phi=-152.543
3D Fisher Tower with two skybridges in the background: http://demo.f4map.com/#lat=39.7488729&lon=-104.9959798&zoom=20&camera.theta=46.089&camera.phi=15.126
3D Auraria rooftop details:http://demo.f4map.com/#lat=39.7446459&lon=-105.0016751&zoom=20&camera.theta=68.033&camera.phi=15.126
3D Three rooftop water tanks: http://demo.f4map.com/#lat=39.7501368&lon=-105.0030764&zoom=20&camera.theta=74.45
3D Coors Field:https://demo.f4map.com/#lat=39.7557655&lon=-104.9941562&zoom=19&camera.theta=66.306&camera.phi=-7.115
3D Downtown church:https://demo.f4map.com/#lat=39.7404669&lon=-104.9817774&zoom=21&camera.theta=55.019&camera.phi=-58.28
3D Auraria church - note the two crosses placed on the roof just for some nice (and accurate) detail:http://demo.f4map.com/#lat=39.7427533&lon=-105.0022680&zoom=21&camera.theta=50.55&camera.phi=99.627
3D Pavilions roof details along with a road through the building:http://demo.f4map.com/#lat=39.7435407&lon=-104.9905719&zoom=20&camera.theta=68.999&camera.phi=-90.882
3D City overview: https://demo.f4map.com/#lat=39.7501783&lon=-104.9973182&zoom=16&camera.theta=69.286&camera.phi=-3.792

Okay, thank you :)

Hello, thank you for your additions to the map. At 600 Broadway, you’ll see a building on top of another building. The imported building is a building which, I think, hasn’t existed for a very long time - I would guess 3-4 years ago it was demolished. Now it sits on top of a structure which actually does exist.  
The building at 120 West 6th Avenue has been changed from a school building to a public building. It looks to me like this is an educational institution?
Part of this import, on Delaware Street, the buildings seem to have incomplete address fields. The minimum requirements for address entries are street number and street name. Also, near the corner of 5th and Delaware there are three examples where two houses have been merged into one.
At the corner of Bannock and 5th, a building has been placed on top of another building.
North of Acoma and 5th, you have recreated buildings which I deleted months ago. This area is clearly marked as a construction zone.
At 100 East Speer Boulevard you’ve created eight buildings where previously there was a single building. Are you certain you are correct in making this change? This doesn’t look correct.
At 123 East Speer Boulevard you’ve created four buildings where previously there was only one. This again, does not look correct. Are you certain of the changes you’ve made here?
At 700 Lincoln Street, bicyle parking node/3448206286 was deleted and a new bicycle node/6215417659 was created. The new parking node has been moved inside the building whereas the old node was outside the building. Was there a reason for this?
At 731 and 739 Sherman there are two buildings that I created four years ago. Now there is a single building added on top of them. Just north of this, at 745 Sherman we have the same situation. A new building has been placed on top of another building.
At 776 Lincoln Street there was a single building. Now there are two. Are you certain about this?
At 700 Broadway, a single building has been divided into 3. Are you certain about this change?
Can you please look this over and correct what needs to be corrected? Thank you :)

Hello, thank you for your additions to the map. If you look at the building at 645 Bannock Street, there are two buildings added on top of the building that has been there for years. For some reason this building has been split in two. I think it’s just one building. Also, the new northern and southern halves have incomplete addresses. There is no number, no street name. Minimum requirements for adding an address are street number and street name. Also, these new buildings are tagged as commercial buildings and they do not have a name. The actual building is a hospital building, not a commercial building. The older building had a correct tag naming the building, “Denver Health Medical Center Pavilion K Engineering”. The import buildings do not have a name attached.
Just to the right of this building is another example of a building being created on top of another, older, established one - 655 Bannock Street. The building created with the import is tagged as a commercial building. The older building is tagged as a hospital building, which is correct. It is not a commercial building. The older building has a name, Denver Health Medical Center Pavilion I. The imported building does not. Again, the imported building has incomplete, thus incorrect, address fields.
South of these two buildings is something that looks very strange. A single building has been split into five separate buildings. Maybe this is correct, but I don’t think so. If you look at the building closely, you’ll see the center section of the building has been “cut out” to create a new building. I really doubt this is correct. Again, all the new buildings have been created as commercial buildings and again, they have incorrect and incomplete address fields.
677 Delaware, name=Denver Health Medical Central Power Plant - a new building has been placed on top of a power substation which already existed. The new building is tagged as industrial, no name, incomplete and incorrect addresses.
On the corner of West 7th and Bannock, you’ll see your import created a completely new building - which I had deleted long ago. This area is clearly marked as a construction zone and this building no longer exists. It was torn down and a new building is going up there. So, this import rebuilt something that only existed in the past.
At 685 Speer Boulevard, one building has been split into two buildings. I’m certain this is only one building. Can you repair the work here? Thank you :)

Also, in case you didn't know, it takes at least a couple of months for maps.me to update. So, it takes a while before you see any edits you've made.

Hey, your trail looks great. Good job. The only thing that could be better is when a trail or a road or a river intersect, they need to be connected with a joining node (link below). I went through and cleaned the trail up so that it doesn't cross the rail anymore, or if it does, it has joining nodes now. If you have any more questions, don't hesitate to ask :) osm.wiki/Node

Hello, the untagged node as you mapped it was showing on maps.me? If so, I'm surprised as it was simply a node without a tag telling maps.me how to render the information. At any rate, the gate showed up as an error because OSM didn't know what the node was. It needs some tags telling OSM what the node is. Of course, it is up to the renderer (in this case maps.me) to decide how to display OSM data. OSM has no control over that. There are some limited options available. Is this gate an entrance to something? If so, it can also be tagged as an entrance. Does the gate or the entrance have a name? If it has a name, it can be tagged with a name. Also, if the road is private and there is no access beyond the gate, that road can be tagged as private. I would assume maps.me would render the road as impassable. If a road is impassable, that would be a good indication that you cannot hike beyond that point :) If you need any help, please let me know.

Hello, thank you for your quick reply. Yes, the assessors maps are a great source of information, but there are examples in Denver where they are not followed precisely. I don’t spend a lot of time in this neighborhood of Denver. However, a mapillary photo of a local street sign designates the street as, Cherry Creek Drive South. The Colorado Department of Public Health and Environment uses this street name: 4300 Cherry Creek Drive South. Also, the 4550 Cherry Creek Apartments list their address as 4550 Cherry Creek Drive South. I found a listing for the Cherry Creek Corporate Center as being, 4500 East Cherry Creek South Drive. This is the only entity I can find that uses “East” as a street name in the area.
So, two entities on the street use Cherry Creek Drive South as well as the street sign - the street sign being the most compelling resource. Using OSM’s "on the ground" rule, I’d say the street is Cherry Creek Drive South with an alt name of East Cherry Creek South Drive.

Hello, some errors have popped up on OSM Inspector concerning your name change of Cherry Creek South Drive to East Cherry Creek South Drive. As a result, buildings that were attached to the street are now unattached to any street in the area. Also, the name and alt name are now the same; meaning there is no alt name? The Colorado Department of Public Health and Environment, located on this street does not reflect your information nor does the Cherry Creek Corporate Center, also located on this street. What is your source for this name change? Thank you.

Hello, in this changeset there are some errors popping up related to addr:street. Some of the errors are: North Elizabeth Street and North Elizabeth Street Unit 101. Could you review these and correct them? Thank you :)

Hello, in this changeset there are some errors popping up related to addr:street. Some of the errors are: North Adams Street, North Cook Street, South Madison Street Apt 102. Could you review these and correct them? Thank you :)

Hello, in this changeset there are some errors popping up related to addr:street. Some of the errors are: North Steele Street, North Steele Street Unit 2n, East 2nd Avenue Ste. Could you review these and correct them? Thank you :)

Hello, in this changeset there are some errors popping up related to addr:street. Some of the errors are: North Clayton Street, North Detroit Street, North Fillmore Street 102. Could you review these and correct them? Thank you :)

Hello, in this changeset there are a number of errors popping up related to addr:street. Some of the errors are: North Elizabeth Street, North Josephine Street, East 5th Avenue Unit 101, North 525 Street Building 1, and East 6th Avenue Unit A. Could you review these and correct them? Thank you :) https://tools.geofabrik.de/osmi/?view=addresses&lon=-104.95193&lat=39.72166&zoom=15&overlays=buildings,buildings_with_addresses,postal_code,entrances_deprecated,entrances,no_addr_street,street_not_found,place_not_found,misformatted_housenumber_lenient,nodes_with_addresses_defined,nodes_with_addresses_interpolated,interpolation,interpolation_errors,connection_lines,nearest_points,nearest_roads,nearest_areas,addrx_on_nonclosed_way

Hello Ferchino83, in this changeset you have deleted traffic signals and added junction=yes incorrectly. Can you please correct these errors? Thank you

Hello Ferchino83, in this changeset you have deleted traffic signals and added junction=yes incorrectly. Can you please correct these errors? Thank you

Hello Ferchino83, in this changeset you have deleted traffic signals and added junction=yes incorrectly. Can you please correct these errors? Thank you

Hello Ferchino83, in this changeset you have added many junction=yes in correctly. Can you please correct these errors? Thank you

Hello Ferchino83, in this changeset you have deleted at least one traffic signal and added junction=yes incorrectly. Can you please correct these errors? Thank you

Hello Ferchino83, in this changeset you have added junction=yes many times incorrectly. Can you correct these errors? Thank you