Objectivity: Market Change and GLA
Tuesday, September 9th, 2025
10AM-2PM Central Time
Instructors: Scott Cullen and Tim Andersen
$119.95
COURSE APPROVAL INFORMATION
Certified for 4 hours of continuing education in the following states:
AL – Course #C03033
AR – Course #AE060
AZ – Course #226
CO – Course #2754
CA – BREA #2410501074
CT – Course #AAL001287
GA – Course #77862
FL – Course #3917
HI – Course #PENDING
ID – Course #1352327
IL – Course #575.010754
IN – Course #PENDING
KS – Course #586.C24.N
KY – APPROVED
LA – Course #A060
MD – Course #PENDING
MA – Course #1360053
MI – Course #20-1243582
MN – Course #1037580
MS – Course #50614
MO – APPROVED
*MT – Accepts
NE – Course #2243494.33
NV – Course #CE.0009875-A
NH – Approved
NJ – Course #2024-214
NM – Course #4476
NY – Course #A5843-04
NC – Course #4680
*ND – Accepts
OH – Course #Q04502108A 24
OK – Course #742
OR – #APEL-C-0824-0087
PA – Course #AA0005599300
SC – Course #2239
SD – Pending
TN – Course #2829
TX – Course #50355
UT – Course #AC240811
VA – APPROVED
WA – Course #A24022089
WI – Course#201265630
WV – APPROVED
*States with an asterisk will accept CE which is approved in the state where it is being taught.
Pending approval in many states!
If you don’t see your state listed, CLICK HERE to send an email to our Education Director, Ben Maxwell and request approval.
Course Description
The GSEs are laser-focused on objectivity in our market-to-market and GLA adjustments. Scott Cullen and Tim Andersen have created a class to address exactly that. In this course, Scott and Tim will review recognized methods for supporting these adjustments, and they’ll show you a graphic representation of the math behind the adjustments using Excel.
You’ll walk away with two ways to calculate a market-to-market adjustment and five ways to support a GLA adjustment. And Scott and Tim will provide you with an Excel workbook ready to use — to show your mathematical support — which you can screenshot and add to your reports.
If Fannie Mae or the state boards ask you questions about your adjustments, you can answer with confidence and show your work.
Course Objectives
- Learn why the GSEs are focused on objectivity in report development and reporting.
- Understand the first priority, the market-to-market adjustment.
- Review the recognized technique of Grouped Data and how it applies to the market-to-market adjustment and how to search MLS for the number of sales required for credible results.
- See how to use the Grouped Data bar chart in the course workbook.
- Understand time series analysis and the MLS export needed to support it.
- Learn how to use simple regression to calculate the GLA adjustment.
- Understand the MLS export required to support simple regression for GLA adjustments.
- Review standard deviation and how to limit variables for a GLA adjustment specific to the subject property.
- Learn the “Ratterman Method” to solve for GLA from sales grid data.
- Understand depreciated cost analysis for the GLA adjustment.
- Learn to use a scatter chart for GLA adjustments using adjusted pairs.
- Understand how to use a scatter chart for GLA adjustments using sensitivity analysis.
Course Author
Scott Cullen
Scott Cullen is a boots-on-the-ground Certified Residential appraiser from Minneapolis / St Paul with 25 years of experience. He is a cofounder of Solomon, a suite of cloud-based calculators that help over 900 appraisers daily to quickly support their adjustments using the recognized technique of depreciated cost analysis.
His calculators come with licensed cost data built-in, making it easy and economical to support your sales grid adjustments. Beyond grid adjustments, Solomon supports other assignment results such as effective age, remaining economic life and site value.
Course Instructor
Tim Andersen
Tim Andersen is an AQB Certified USPAP Instructor, consultant, and reviewer. He also does commercial real estate appraisal and Florida tax appeal work. He travels throughout the US teaching USPAP, and is an Approved Instructor for the Appraisal Institute. Have PowerPoint, Will Travel. Besides all facets of commercial real estate appraisal, other areas of expertise include writing, producing, and presenting webinars on all areas of real estate appraisal.
Specialties: Appraisal Institute member, designated as an MAI, Master of Science degree in Real Estate Appraisal , AQB Certified, USPAP Instructor, State Certified General Real Estate Appraiser, Instructor with the Appraisal Institute, Experienced Public Speaker
