I refinanced several times and had decent costs each time to do are any of these costs eligible to be added to basis?
No. Refinancing costs are supposed to be amortized and depreciated over the life of the loan. They have no effect on the cost basis of anything.
Depreciation taken on schedule E reduces my basis?
That's one way (and the most common way) to look at it.
Closing costs (title fees, commissions, etc) to sell can these be added to basis?
Sounds more like sales expenses to me, and nothing that would change the basis of anything.
If the home sold for say $450k and the land is worth $250k would you put $200k in the asset sales price, and $250k in the land sales price?
Some of that $200k for asset sales price will need to be allocated to any other assets.
Remember, if you sold at a gain then you need to show a gain on each and every asset. Otherwise, the recaptured depreciation will be included in the capital gain an taxed at the higher capital gains tax rate.
