@Tom Kaz SBA 504 loan should only require 15% down for you since they don't consider storage a special use so they should only hit you with 1 extra 5% requirement since you, as a new storage investor, are not an existing business.
Besides the usual operating expense numbers the existing owner might show, its important to know what additional expenses an appraiser may put on the property during the valuation process for financing since it affect your ability to borrow. In my experience, even if the current owner self manages the property an appraiser is going to put a management fee expense in the valuation. Plus I'm of the mind set even if you self manage you should be paying yourself for that time on top of the return the property provides. They'll also put in a reserve expense to budget for repairing large cap ex items that may need to be replaced in the future (paving, roofing, doors, etc). Below is my quick and dirty estimate of how I would value the property based on you above post. I might be off in my lawn/snow costs, utilities, etc since I don't know the specific area, but in my area this is roughly what a property of this size would look like.
Income | Rent |
12x36 | 4 | 170 | $8,160 |
12x40 | 2 | 200 | $4,800 |
10x20 | 14 | 115 | $19,320 |
6x10 | 11 | 65 | $8,580 |
Gross Rent | $40,860 |
Less Vacancy | 10% | ($4,086) |
Total Income | $36,774 |
Expenses |
Taxes | $10,000 |
Insurance (estimate) | $2,000 |
Snow | $1,000 |
utilities | $600 |
Management | $1,839 | 5% |
Reserve | $1,103 | 3% |
Maintenance (estimate) | $735 | 2% |
Total Expenses | $17,277 |
Income | $36,774 |
Expenses | ($17,277) |
NOI | $19,497 |
Cap Rate | 8.00% |
Property Value | | | $243,708 |