Hotels >3 stories fall under Group R occupancy per the IBC. So, you could model the baseline as a System 8 (PTHP).8.

IECC-2021

GROUP R. Buildings or portions of buildings that contain any of the following occupancies as established in the International Building Code:

1. Group R-1.
2. Group R-2 where located more than three stories in height above grade plane.
3. Group R-4 where located more than three stories in height above grade plane.

IBC-2021

310.2 Residential Group R-1. Residential Group R-1 occupancies containing sleeping units where the occupants are primarily transient in nature, including:

• Boarding houses (transient) with more than 10 occupants
• Congregate living facilities (transient) with more than 10 occupants
• Hotels (transient)
• Motels (transient)

Hotels >3 stories fall under Group R occupancy per I believe hotels are considered "residential", at least according to 90.1 (check the IBC. IECC definitions, I don't have a copy handy). So, you could model the baseline as a System 8.

GROUP R.90.1-2019 Buildings or portions of buildings that contain any of the following occupancies as established in the International Building Code:

310.2 Residential Group R-1.residential: spaces in buildings used primarily for living and sleeping. Residential Group R-1 occupancies containing sleeping units where the occupants spaces include, but are primarily transient not limited to, dwelling units, hotel/motel guest rooms, dormitories, nursing homes, patient rooms in nature, including:hospitals, lodging houses, fraternity/sorority houses, hostels, prisons, and fire stations.

I believe hotels are considered "residential", at least according to 90.1 (check the IECC definitions, I don't have a copy handy). So, you could model the baseline as a System 8.

Baseline systems don't have to make sense, they're fake buildings. For example, in 90.1 many multi-zone systems are zoned by floor (i.e. horizontally or one AHU per floor), which isn't how they're typically zoned in practice (usually vertically or east-west or north-south). buildings.

90.1-2019

residential: spaces in buildings used primarily for living and sleeping. Residential spaces include, but are not limited to, dwelling units, hotel/motel guest rooms, dormitories, nursing homes, patient rooms in hospitals, lodging houses, fraternity/sorority houses, hostels, prisons, and fire stations.

I believe hotels are considered "residential", at least according to 90.1 (check the IECC definitions, I don't have a copy handy). So, you could model the baseline as a System 8.

Baseline systems As far as codes go for baseline systems, they don't have to make sense, "make sense", they're fake buildings.

90.1-2019

residential: spaces in buildings used primarily for living and sleeping. Residential spaces include, but are not limited to, dwelling units, hotel/motel guest rooms, dormitories, nursing homes, patient rooms in hospitals, lodging houses, fraternity/sorority houses, hostels, prisons, and fire stations.

I believe hotels are considered "residential", at least according to 90.1 (check the IECC definitions, I don't have a copy handy). So, you could model the baseline as a System 8.

As far as codes go for baseline systems, they don't have to "make sense", they're fake buildings.

90.1-2019__90.1-2019__

residential: ___residential:___ spaces in buildings used primarily for living and sleeping. Residential spaces include, but are not limited to, dwelling units, hotel/motel guest rooms, dormitories, nursing homes, patient rooms in hospitals, lodging houses, fraternity/sorority houses, hostels, prisons, and fire stations.

I believe hotels are considered "residential", "residential" (check the IECC definitions), at least according to 90.1 (check the IECC definitions, I (I don't have a copy of IECC handy). So, you could model the baseline as a System 8.

As far as codes go for baseline systems, they don't have to "make sense", they're fake buildings.buildings.

__90.1-2019__

___residential:___ spaces in buildings used primarily for living and sleeping. Residential spaces include, but are not limited to, dwelling units, hotel/motel guest rooms, dormitories, nursing homes, patient rooms in hospitals, lodging houses, fraternity/sorority houses, hostels, prisons, and fire stations.