However if landlord is providing a good service to someone and they do not like it, landlord should have no problem finding someone who does a appreciate a reasonable fair house

Have you looked onto house-hacking? 

After the appraisal, the house got undervalued, so the seller had to bring the price down and agree with that. 

They typically do not add value to the house, so when the buyers are looking at comparables, none of them sit there and say...well every other house sold for $200,000, but my gosh this one has solar panels....let's pay $240,000 for this one.Maybe one day, maybe someplace, but NOT today in NJ I expect.Only way I would even look at solar panels is if it is for your forever house, and you have enough land to install them on the ground, not on the roof....so maybe if you have 1-5 acres or more. 

@Manuel A Zuaznabarcan you start with a house hack

Hello, I own a rental house on a large lot and I'm planning to divide the lot to build a duplex for renting out.

Its very risky in this market that we just came out of the "highest" in history of property inflation due to mostly the covid/pandemic.I think the other flip side is trying to use the equity to buy more properties so in most cases letting the property appreciate or doing renovations is the safer way to get the equity up without essentially borrowing your own money back in 5 years.

Yes, sharing our actual costs,  we need more housing but also letting people get past some of the big unknowns.   

I'm considering purchasing a residential lot in the DFW area to build a house.

As an example if your house was going to sell in two weeks for full price, and some random person came up to you and said I really want this house but I need six weeks to get you the money.