@Michael Plaks
I see no issue S179ing 1245 property used in a residential real estate trade or business as long as it passes with flying colors the other provisions of Sec 179.
My source for this is the highest level of authoritative guidance: Internal Revenue Code Sec 179. Particularly subsection "d" and the last sentence in Sec 179(d)(1)(A):
Such term shall not include any property described in section 50(b) (other than paragraph (2) thereof).
It's likely Pub 527 hasn't been updated. Ironically, chapter 2 of Pub 946, which it references, certainly has.
"it may be that the IRS interprets lodging as hotel-type only"
They could take that position, but we first have to examine what is lodging as it pertains to Sec 179. IRC Sec 179 directly references IRC Sec 50(b)(2):
50(b)(2)Property Used for Lodging
No credit shall be determined under this subpart with respect to any property which is used predominantly to furnish lodging or in connection with the furnishing of lodging. The preceding sentence shall not apply to—
50(b)(2)(A)
Nonlodging commercial facilities which are available to persons not using the lodging facilities on the same basis as they are available to persons using the lodging facilities;
50(b)(2)(B)
Property used by a hotel or motel in connection with the trade or business of furnishing lodging where the predominant portion of the accommodations is used by transients;
50(b)(2)(C)
A certified historic structure to the extent of that portion of the basis which is attributable to qualified rehabilitation expenditures; and
50(b)(2)(D)
Any energy property.
I would take the position that hotel-like activity is a sub-set of lodging under Sec 50(b). Lodging is actually more broad and expansive. The Service could be difficult and say no to that. At that point, as decades of case law have prescribed, we should look to the common definition or usage of the word when there is question of legislative intent. Merriam-Webster:
Definition of lodging
1a : a place to live : DWELLING
b : LODGMENT sense 3b
2a(1) : sleeping accommodations
found lodging in the barn
(2) : a temporary place to stay
a lodging for the night
b : a room in the house of another used as a residence —usually used in plural
3 : the act of lodging
Note the first and most common definition. Again, I'm comfortable with S179 used on residential rental 1245 property.