Application of Section 506 with two buildings on the same lot

I am unsure how to determine the maximum floor area for a proposed new building that will be detached from an existing building on the same lot. The existing building is a non-sprinklered, type VB, single story, B occupancy. The proposed single story building will also be Type VB, occupancy group B, however it will be equipped throughout with an automatic sprinkler system. Due to the size of the site, the aggregate areas of the two buildings must comply with the floor area limitations contained in table 503 as specified in section 503.1.2

When calculating the maximum floor area of the new building, I would like to utilize the allowable area increase for sprinklers as specified in section 506.3. However I am uncertain how one would apply the allowable area increase specified in Section 506 since the existing building is non-sprinklered

I am assuming that the allowable floor area for each building should be calculated individually per equation 5-1, using Is=0 for the non-sprinkled building and Is=2 for the new building, then insure that the sum of the actual/allowable floor area ratios does not exceed one as outlined in section 508.3.3.2. However since both buildings are of the same occupancy, I am uncertain if this is acceptable.

Is there anywhere in the code that addresses allowable areas for multiple buildings when one building is sprinklered and one isn’t?
Original Post
Treat each building as separate buildings.

Reread 503.1.2. "Two or more buildins on the same lot shall be regulated as separate buildings or shall be considered as portions of one building if the height of each building and the aggregate area of buildings are within the limitations of Table 503..."

Also, for the new single-story building, I(s) will be 3.
The existing building exterior wall that will face the new building is non-rated. The new buildings exterior wall facing the existing building will have a large number of openings. Due to minimal depth of the lot, I can't place an imaginary property line between the two buildings and still comply with opening restrictions and wall rating requirements. Therefore they cannot be regulated as separate buildings.
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