Making a lot Growable

[Freeseus 1]

I'll start really quick by declaring my personal direction and intentions before asking my question - this should help with understanding where I'm coming from.

I don't use custom ploppables in my cities and dislike custom landmarks in general because most of them lack the ability to blend in with the original simcity menu system, design, and layout. Some might call this finicky.
I am however, a big advocate of custom content - particularly user-created buildings on custom lots. So, I'm a huge fan of growables... because they don't alter the game too much (and those that have skewed settings - pollution, garbage, electric, water etc... I 'fix' personally)

I have found a building that I liked... but it was a landmark only version. Doh! So, I decided to try to make it into a growable. Should be pretty simple. I copied the main exemplar file from another growable that worked (we'll call this building, [bUILDING BLACK]) and pasted that main exemplar file into the landmark only building we'll call, [bUILDING RED]. I copied most of the relevant values from the [bUILDING RED]'s landmark exemplar and pasted them into the cooresponding sections in the recently pasted GROW exemplar file. These values are like: Exemplar Name, Query Exemplar GUID, power, water, fire etc.

Booted up SC4-DeluxeEdition

Walla! Or sort of.

BUILDING BLACK has been replaced by BUILDING RED in all of my cities. So, I have successfully converted the landmark into a growable... but at the expense of my BUILDING BLACK. If I remove the BUILDING RED from the plugins folder (or just the GROW exemplar in BUILDING RED), then BUILDING BLACK will reappear correctly. If I remove BUILDING BLACK from the plugins folder, BUILDING RED still works correctly. So, I conclude that BUILDING RED and BUILDING BLACK are sharing a unique building indentification thingie, and when Simcity4 boots up, it just decides to choose BUILDING RED over BUILDING BLACK. What is the name of this indentification thingie and where is it in the GROW exemplar file? Picking a random number (I assume it's a hex 0x344GDF number) should fix this unless that number is a duplicate as well right? I've gone through and tried different values but I can't find the indentification thingie. What is it called and where it is?

Thanks.

[Freeseus 1]

Perhaps it's the instance on the DIR file? Both files have the same value under the instance... but I can't seem to change it!

[Andreas Roth 605]

It is likely that you might have forgotten something, or that some IDs got mixed up. The proper way to convert a ploppable into a growable is to make an entire new lot and building exemplar file, and then copy only the relevant properties. I posted a tutorial here: https://www.sc4devotion.com/forums/index.php?topic=2550.0