My question is in regards to factoring in the cost to upgrade a new bathroom even if the bathroom has the basic of basic necessities??

Even though it has been stressful at times (being told by my renter that the hallway carpet was soaking wet behind the bathroom wall) it has been a great growing experience. 

My wife and I Rehabbed the property by knocking down walls, remodeling bathrooms, redoing the kitchen, replaced roof, added new flooring, and some other stuff over the last 2.5 years we have lived there.We found a great tenant (hopefully) to Rent the house from us by utilizing the guides and info here on BP.

Since getting the $150K includes adding a bedroom and a bathroom, and will most likely take 90 days anyway, I think its worth doing. 

I called listing agent and he said there is a 600K lien and mentioned a bathroom which was built without permits.

They all range in the amount of work needed upfront (roof, flooring, kitchen(s), bathroom).

They can literally see us walk in/out of the bathroom unless we have the curtains drawn, but then there's no natural light in the living room.We would like to build an 8-ft tall cinder block wall (similar to our one with the other neighbor) between us and the apartments.

It has 3 bedrooms and 1 bathroom.

Design fees on a bathroom are going to be near the 15% range, whereas a complete house design is going to be in the 5-10% range...   ...unless you're having a high-end custom home built, then figure 15% (or more) for an architect.Anyways, I hope this helped.Brandon

If it's a really nice bathroom and kitchen because the area has slightly gentrified, then $12k becomes $20k in short order.)3 months downtime, $250pm extra in rent.