For example, just because you spent $100K on those renovations doesn't mean you will get them fully reimbursed in a sale - not if there's something in the board's rules of resale or in a formula for resale you may not know about, that was created for such a purpose.
If you have concerns, be sure you talk to the board and possibly contact UHAB - or look up "resale guidelines" on their site - if you need more information.
The renovations for capital improvements must be fully documented. Contractors bills for the renovation supported by proof of payment are generally required. Dated photos of the before and after are important. With this documentaion, upon sale you will then demonstrate that the "cost basis" of the property to include the purchase price plus renovations.
To the cost basis, you cannot add a paint job or replacement of an item that wears under normal use.
To compute your profit, simply subtract the renovation cost from the sales price. If you make a large profit, its good for you and the city.
As a point of interest, I've never seen a $100k renovation ever cost $100k. It is often 20-50% higher than the original estimate. Good luck and keep in touch.