New Development Building Sq Ft Efficiency Benchmarks

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I am the senior development analyst for a developer that builds all property types from hotels to student housing etc.  I spend a large portion of my time doing high-level new development analysis.  I am trying to establish a benchmark of building sq ft efficiency (leasable or useable sq ft /gross sq ft) plug percentages.  Here are my current ratios:

Office 2-4 Levels : 86% lsf

Office 5 - 40 Levels: 84% lsf

Hotel mid & high rise: 79% lsf

Conference Center:  81% lsf

Apartment Garden: 88% lsf

Apartment Mid-Rise: 86% lsf

Apartment High-Rise: 85% lsf

Student Housing: 83% lsf

Please note these are just plug percentages for new development at a high-level.  This is before speaking to an architect.  I am curious to hear your opinion if a ratio needs to increased or decreased.

Here is an update.  After speaking with well seasoned developers/architects/construction companies here are the initial building efficiency plug figures at a high level analysis that I will be using.

Office : 90% lsf

Hotel mid & high rise: 80% lsf

Ground level Retail: 95% lsf 

Conference Center: 70% lsf

Apartment Garden: 87% lsf

Apartment Mid-Rise: 86% lsf

Apartment High-Rise: 85% lsf

Student Housing: 84% lsf

@Account Closed The question came about because of a project that I was working on in the Scottsdale area.  I will use these figures throughout the country but probably excluding San Francisco and New York since space is so vertical.  I would assume the efficiency numbers would bump up for these highly dense populated markets.