Just for future reference for this thread.
Before the lease is signed, you should inquire about improvements you need, and who pays. In fact, this should be done at the original showing. Often I show the place to over a dozen renters in a weekend open house, and people would ask me if I would do this, that, or the other thing for them if they take the place.
This is the point where I would agree or not agree to pay for anything.
For instance, once I had a very nice retired lady and her husband wanting the place, I just rehabbed the place, and we didn't yet install a range hood in the kitchen, nor done anything for the shabby lawn. And it sounds to me she wanted me to get these things done if I was going to rent to her.
My answer was "I'll take care of it if we rent the house to you, but I still have a long list of people scheduled to come".
Then, an hour later, another renter who came by, loved the house, and had relatives in town, asked that if I can rent to him, and he would install a range hood at his expense, but with my approval, and he would at his expense, fertilize, seed and cultivate the lawn, making it look like the well manicured ones across the street.
I thought to myself "well, that's cool".
A few days went by, I was still showing the place, and a local real estate agent said she knew of a nice elderly couple who really wanted the place, they in fact saw it themselves, and asked her if she can find out why we haven't gotten back to them. So I told the agent that if it's this same couple who wanted the range hood installed, and a new lawn put in, the reason I haven't gotten back to them is I already have a few people really wanting it bad, but they were going to pay for the improvements if I rented the place to them.
The agent called me back to say that it's the same couple I mentioned. I asked this agent that if it was her, would she rent to someone where I had to make a bunch of improvements in order to rent the place, or instead to a number of others who volunteered to do the improvements, on their dime??
Her answer was "of course, I would rent to those who's going to put some money into the place".
Bottomline is, negotiations for improvements takes place early on, and it give the landlord the opportunity to select someone where I don't have to make expensive improvements to make them happy, but to those who can spend some money on the place to make me happy.
As an example, in your case, I could've rented the place to someone else not needing a 220 line, had I known early on that you expected me to pay for one.

