They need to complete all the lease stipulations and sign a lease by xx date or they lose their deposit.

I told him to let me think about it and I'd get back with him soon.I just worry that if I ever decide to sell the house that a walk-in tub would negatively affect the re-sell value, especially given that this is essentially a starter type home...My initial reaction is no, but then I think that if they want to make this change and pay for the modification, they have no intention of leaving and I would have a very long term, dependable tenant.Could I stipulate that they can change it out but if they decide to leave they have to swap it out for a one piece shower/tub combo that I originally had?

The IRS stipulates that there be a continuity of taxpayer from relinquished property to replacement property.

The only stipulations to get the loan is that you live in it for a year and that it is the first house you have ever purchased.

I would avoid acquiring the property adjacent to your IRA owned property personally.IRS rules stipulate that there may be no direct or indirect benefit between a plan and a disqualified person. 

I actually put a stipulation in the lease that says if I installed a A/C, then the rent would go up to $1050.

I would not allow that and I would add that stipulation into my purchase contract.

I further stipulated I would pay a small fee every single month toward the electric bill and set it up on auto pay and do so.

Which was the stipulations the selling agent made with the owner.

As far as interior inspections, our lease contracts state how much notice will be given but does not stipulate how often.