I haven't used this, but is there a specific reason why the macro
returns the result in a fixed variable name? If you simply write

union {
   object {HouseBlock}
   object {Single}
}

without #declare you can use the macro like this

#declare HouseBlock = Urbanism(
   ...
)

or like this

object
{
   Urbanism(...)
   textures {...}
}

Also there are some other uses of #declare in the macro
that are probably intended to be #local.

Not a criticisms, just a general observation that coding is
usually less confusing if something you call "returns a value"
as opposed to having "side effects".

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