"3671 Whisymound Dr" is a location in Grand Theft Auto V
After you complete Hotel Assassination for Lester, he will use some of the profits to buy this house for Franklin. This acts as the safe house for Franklin hereafter opposed to his shared place in Strawberry (but it could still be used).
The layout is very different from the first house. On the top level you have the kitchen and the TV. On the lower level you have a pool, Chop, bedroom and closet.