Self storage deal analyzation- yet again asking for help

[Steven Cowles]

So I am analyzing my first deal and trying to come up with a good value for the property. Please help!

Asking price: $210,000

66 storage units

100% occupied currently

Generating $3,300 a month gross

Taxes: $4500 per year

Insurance: $1500 per year

Book keeping: $1200 per year

Does $210,000 sound like too high or too low? After I run all the numbers if I bought it at $200,000, it seems pretty solid being that it is netting around $30,000 a year (if my math is correct) but I have never done this before. Any help would be great.