@jimmyruss,
You probably could use a lawyer's input, but here's what I would do:
To answer your question: Yes. It is reasonable for a split. But it might get complicated.
An appraisal of the property should have been done as soon as you inherited it, but anyway, get an appraisal now of the entire property.
Then deduct the time and effort your brother has spent taking care of this property, including repairs, taxes, etc. or any other expenses he has accrued.
Figure out what the rental would be on the house and consider that as his part of the inheritance.
Do the math and either sell it all and split or he should buy you out. (With the economy as it is, perhaps him paying you in installments could be arranged. That may be the only way you can get your money, now.)