It is short for San Francisco.
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	3	nsubj	3:nsubj	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	cop	3:cop	_
3	short	short	ADJ	JJ	Degree=Pos	0	root	0:root	_
4	for	for	ADP	IN	_	5	case	5:case	_
5	San	San	PROPN	NNP	Number=Sing	3	obl	3:obl:for	_
6	Francisco	Francisco	PROPN	NNP	Number=Sing	5	flat	5:flat	SpaceAfter=No
7	.	.	PUNCT	.	_	3	punct	3:punct	_
