The Sun Park Hotel is a tourist hotel in Kiyosato, Yamanashi Prefecture, which has been abandoned since approximately 1990. I read about it online, and explored it in the spring of 2014. The building is an attractive four storey structure, with three evenly spaced wings radiating from the centre. From a distance it scarcely looks abandoned, until you notice the rusty fire escape and collapsing terrace.
There was a small bar on the ground floor. I looks like it was once a pleasant place to have a quiet drink.
The lobby was a shambles, with wallpaper hanging from the walls and ceilings, and the filthy floor sagging underfoot. A staircase led to the upper levels.
This restaurant on the ground floor was still in surprisingly good condition. I think it was once possible to dine on the wooden terrace outside, but most of it had collapsed, and what was left of it was in no condition to be walked on.
Passing through the kitchen, I found some staff rooms and a small dormitory. These rooms were even better preserved than the restaurant. Water is the main agent of decay, so if rooms stay dry they can remain in good condition for a long time. Presumably the roof over this part of the hotel is still intact.
A calendar on one of the walls was open at January 1990.
Above the ground floor were two floors of guest rooms. Some of the corridors were a shambles. I think this was the work of copper thieves, who ripped down the ceilings, removed the pipes, stripped off the insulation, and left it scattered on the floor. Rainwater had found a way in, allowing a large patch of moss to grow near the stairs.
The guest rooms themselves were in better condition. They were cramped, but no worse than a lot of other Japanese hotels. The décor was a little pretentious, especially the ornate, old-fashioned telephones. The televisions had coin boxes to pay for the video channel, which probably showed pornography. It cost ¥300 for 30 minutes, which seems a bit steep. I've seen such coin boxes in cheap business hotels, but they looked tacky in a tourist hotel with pretensions of being classy.
I was unable to find the stairs to the topmost floor, which I suspect contained the employee dormitories. Later on, while viewing someone else's photographs online, I realised where the staircase was. The next time I'm in the area I'll have to make another visit to complete my exploration.