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GOG started selling SIMCITY 3000 Unlimited on July 14, 2016 on sale for half off.

You can get your up-to-date LCD resolutions with a Hex Editor

Download game
Download and install free HxD hex editor here

Open HxD then go to File – Open – browse for SC3U.exe found in the App folder in the SIMCITY 3000 ( in my case it was C:\GOG Games\SimCity 3000 Unlimited\Apps)
Select SEARCH – FIND – and change Datatype from Text-string to Hex-values
Copy
8B 4C 24 04 8B 44 24 08 53
Paste it to the Search – Find box – select OK
Highlight first four bytes 8B 4C 24 04 by dragging over the numbers with your mouse
Right Click over the highlighted 8B 4C 24 04 and select “Fill selection”
Copy
c2 08 00 90
Paste it into the “Hex values” line and select OK

One more to go . . .

Copy
8B 4C 24 04 8b 54 24 08 81 F9
Paste it to the Search – Find box – select OK
Highlight first four bytes 8B 4C 24 04 by dragging over the numbers with your mouse
Right Click over the highlighted 8B 4C 24 04 and select “Fill selection”
Copy
c2 08 00 90
Paste it into the “Hex values” line and select OK
Select FILE – SAVE and close HxD

You’re done, now open the game and change the resolution under preferences.
You will now see resolutions supported by your LCD. I’ve tested 2560x1440 and 2560x1600 without issue. I’ve tested some other resolution and got a black screen. This black screen issue will vary per LCD but it should work on the highest resolution you can get. I had to uninstall the game and re-install, then use HxD again to fix various resolutions I was testing.

Source of the Hex Values found here

Youtube video of what SIMCITY 3000 Unlimited looks like at 1080P