Dog pees every time we go to leash him?

He is a 3 year old dog, and very beta male. We have had to move into an apartment, and every time we go to put the leash on him to take him walking, he pees all over the place. We have tried ignoring it, not taking him out until he calmed down, but usually by that point, the house is covered in pee. We have tried sitting on the floor at his level, and all that gets us is peed on. We talk soothingly to him, and he loves going for walks, but my rugs just can't take much more of this. Help!