I will second Juji's post, with a slightly more reputable source than Wiki
From Gardner Read (Yay! my library is out of mothballs):
Quote:
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Originally Posted by Music Notation A Manual of Modern Practice
Although there is no good reason why the sign 15ma bassa would not be used for the double octave below the bass staff, its use is so rare as to be virtually nonexistant. The test for all octave signs, as for other musical symbols, must be: "would this sign make the music easier to read? Easier to understand?"
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In the example you posted above, the logical notation would be to have both right and left hands in the upper treble clef staff, while the low sutained note would be in bass clef, in the lower staff.
Another possibility, to which you may not have access depending on which notation package you are using, would be a single measure of "third staff" below the two pre-existing staves, in which to contain that bass clef note.
N.B. just an additional bit of notation correction, first staff of your example: you MUST place a sharp/natural on the right hand A to indicate whether it is still natural like the left hand or not.